Fix foundations links by removing '.html' (#550)

* fix internal links

* Update preamble/how-to-use.md

Co-authored-by: Katelyn FitzGerald <[email protected]>

---------

Co-authored-by: Katelyn FitzGerald <[email protected]>

Author: jukent

CONTRIBUTING.md

@@ -1,2 +1,2 @@
 Information on how to contribute to this repository can be found
-in the [Pythia Foundations Contributor's Guide](https://foundations.projectpythia.org/appendix/how-to-contribute.html).
+in the [Pythia Foundations Contributor's Guide](https://foundations.projectpythia.org/appendix/how-to-contribute).

appendix/how-to-contribute.md

@@ -59,4 +59,4 @@ To update all packages in the currently activated environment to their latest ve
 conda update --all
 ```
 
-[Contributing to Project Pythia]: https://projectpythia.org/contributing.html
+[Contributing to Project Pythia]: https://projectpythia.org/contributing

core/overview.md

@@ -109,7 +109,7 @@ Similarly, a group at the Atmospheric Radiation Measurement (ARM) Climate Resear
 have released their Python ARM Radar Toolkit ([Py-ART](http://arm-doe.github.io/pyart/))
 for analysing weather radar data.
 
-A great place to start learning about use-cases for domain-specific libraries across the geosciences is the [Pythia Cookbook Gallery](https://cookbooks.projectpythia.org). Also check out the [Pythia Resource Gallery](https://projectpythia.org/resource-gallery.html) and try filtering by domain. The [Python for Atmosphere and Ocean Science (PyAOS) package index](https://pyaos.github.io/packages/)
+A great place to start learning about use-cases for domain-specific libraries across the geosciences is the [Pythia Cookbook Gallery](https://cookbooks.projectpythia.org). Also check out the [Pythia Resource Gallery](https://projectpythia.org/resource-gallery) and try filtering by domain. The [Python for Atmosphere and Ocean Science (PyAOS) package index](https://pyaos.github.io/packages/)
 attempt to keep track of the domain-specific libraries in these subfiels.
 
 

foundations/conda.md

@@ -17,7 +17,7 @@ Here we will cover:
 
 | Concepts                                                                                                  | Importance | Notes |
 | --------------------------------------------------------------------------------------------------------- | ---------- | ----- |
-| [Installing and Running Python](https://foundations.projectpythia.org/foundations/how-to-run-python.html) | Helpful    |       |
+| [Installing and Running Python](https://foundations.projectpythia.org/foundations/how-to-run-python) | Helpful    |       |
 
 - **Time to learn**: 20 minutes
 

foundations/getting-started-jupyter.ipynb

@@ -130,7 +130,7 @@
     "\n",
     "You can launch JupyterLab from a terminal; it will open up in a web browser. The application will then be running in that web browser. When you open a notebook, Jupyter opens a kernel which can be tied to a specific coding language.\n",
     "\n",
-    "To launch the JupyterLab interface in your browser, follow the instructions in [Installing and Running Python: Python in Jupyter](https://foundations.projectpythia.org/foundations/jupyter.html).\n",
+    "To launch the JupyterLab interface in your browser, follow the instructions in [Installing and Running Python: Python in Jupyter](https://foundations.projectpythia.org/foundations/jupyter).\n",
     "\n",
     "![Local Execution Model](../images/local-execution-model.gif)"
    ]

foundations/github/basic-git.md

@@ -54,7 +54,7 @@ That's the first thing to understand. GitHub is a web-based platform for hosting
 
 #### A little history and nomenclature
 
-Git has been around [since the mid-2000s](https://en.wikipedia.org/wiki/Git). It was originally written by Linus Torvalds specifically for use in development of the Linux kernel. Git is [FOSS](https://foundations.projectpythia.org/foundations/github/what-is-github.html#free-and-open-source-software-foss) and comes pre-installed on many Linux and Mac OS systems.
+Git has been around [since the mid-2000s](https://en.wikipedia.org/wiki/Git). It was originally written by Linus Torvalds specifically for use in development of the Linux kernel. Git is [FOSS](https://foundations.projectpythia.org/foundations/github/what-is-github#free-and-open-source-software-foss) and comes pre-installed on many Linux and Mac OS systems.
 
 There are many other VCSs out there. A few that you might encounter in scientific codebases include [Subversion](https://subversion.apache.org), [Mercurial](https://www.mercurial-scm.org), and [CVS](https://en.wikipedia.org/wiki/Concurrent_Versions_System). However, git is overwhelmingly the VCS of choice for open-source projects in the Scientific Python ecosystem these days (as well as among software developers more generally).
 

foundations/github/contribute-to-pythia.md

@@ -29,19 +29,19 @@
 
 ---
 
-Now that you have become more familiar with how to use Git and GitHub, you might have an idea or some material that you want to contribute to Project Pythia! The [Project Pythia Contributor's Guide](https://projectpythia.org/contributing.html) describes the steps required to submit a PR to any of Project Pythia's repos. Here, we will go through an example of submitting a PR to `pythia-foundations`.
+Now that you have become more familiar with how to use Git and GitHub, you might have an idea or some material that you want to contribute to Project Pythia! The [Project Pythia Contributor's Guide](https://projectpythia.org/contributing) describes the steps required to submit a PR to any of Project Pythia's repos. Here, we will go through an example of submitting a PR to `pythia-foundations`.
 
 ## Suggest a change
 
-One simple way to contribute is to fix a typo or suggest a change to one of the tutorials. For example, in the [Computations and Masks with Xarray tutorial](https://foundations.projectpythia.org/core/xarray/computation-masking.html), let's suggest a clarification that the sea surface temperature is called `tos` in the dataset we are using.
+One simple way to contribute is to fix a typo or suggest a change to one of the tutorials. For example, in the [Computations and Masks with Xarray tutorial](https://foundations.projectpythia.org/core/xarray/computation-masking), let's suggest a clarification that the sea surface temperature is called `tos` in the dataset we are using.
 
 <img src="../../images/GitHubContrXarray.png" alt="Computations and Masks with Xarray">
 
 We could open an issue to suggest this change in order to get feedback on the idea before we take the time to edit files, but since this is such a small change, let's just create a PR.
 
 ## Make the edits
 
-We will follow the [Forking Workflow](https://foundations.projectpythia.org/foundations/github/github-workflows.html#forking-workflow) described in the previous section of this tutorial, assuming `pythia-foundations` has already been forked:
+We will follow the [Forking Workflow](https://foundations.projectpythia.org/foundations/github/github-workflows#forking-workflow) described in the previous section of this tutorial, assuming `pythia-foundations` has already been forked:
 
 - Create a new branch with a descriptive name
 - Make the changes and commit them locally
@@ -78,7 +78,7 @@ Now, going to our remote repo on GitHub, forked from `pythia-foundations`, we se
 
 <img src="../../images/GitHubContrFork.png" alt="GitHub Forked Repo">
 
-Project Pythia has an automated reviewer system: when a PR is created, two members of the organization will be randomly chosen to review it. If your PR is not immediately ready to be approved and merged, open it as a draft to delay the review process. As shown in this [Git Branches section](https://foundations.projectpythia.org/foundations/github/git-branches.html#merging-branches), the "Draft pull request" button is found using the arrow on the "Create pull request" button.
+Project Pythia has an automated reviewer system: when a PR is created, two members of the organization will be randomly chosen to review it. If your PR is not immediately ready to be approved and merged, open it as a draft to delay the review process. As shown in this [Git Branches section](https://foundations.projectpythia.org/foundations/github/git-branches#merging-branches), the "Draft pull request" button is found using the arrow on the "Create pull request" button.
 
 Let's add the `content` tag and open this one as a draft for now:
 

foundations/github/github-repos.md

@@ -13,7 +13,7 @@
 
 | Concepts                                                                                        | Importance | Notes |
 | ----------------------------------------------------------------------------------------------- | ---------- | ----- |
-| [What is GitHub?](https://foundations.projectpythia.org/foundations/github/what-is-github.html) | Necessary  |       |
+| [What is GitHub?](https://foundations.projectpythia.org/foundations/github/what-is-github) | Necessary  |       |
 
 - **Time to learn**: 15 minutes
 
@@ -52,7 +52,7 @@ As you can see by the recent timestamps, these repositories are actively changin
 :class: tip
 Notice that each of the three *Repositories* each exist as part of their own *Organization*. In other words, the NumPy repository exists within the NumPy organization; the Xarray repo exists within the Pydata org, and so forth.
 
-When you [create your own GitHub account](https://foundations.projectpythia.org/foundations/github/what-is-github.html), your user ID functions as the *organization*. Any repositories you create (and therefore, *own*) will exist within that org.
+When you [create your own GitHub account](https://foundations.projectpythia.org/foundations/github/what-is-github), your user ID functions as the *organization*. Any repositories you create (and therefore, *own*) will exist within that org.
 ```
 
 Another example is this project's [Pythia Foundations repository](https://github.com/ProjectPythia/pythia-foundations), on which this tutorial is stored. It is owned by the [Project Pythia organization](https://github.com/ProjectPythia). This organization also owns several other repositories that store the files needed to generate <https://projectpythia.org/>, among other things.

foundations/how-to-run-python.md

@@ -13,7 +13,7 @@ This section provides an overview of different ways to run Python code, and quic
 
 | Concepts                                                                         | Importance | Notes |
 | -------------------------------------------------------------------------------- | ---------- | ----- |
-| [Why Python?](https://foundations.projectpythia.org/foundations/why-python.html) | Helpful    |       |
+| [Why Python?](https://foundations.projectpythia.org/foundations/why-python) | Helpful    |       |
 
 - **Time to learn**: 20 minutes
 

foundations/jupyter.md

@@ -14,7 +14,7 @@ You'd like to learn to run Python in a Jupyter session. Here we will cover:
 
 | Concepts                                                                                                  | Importance | Notes |
 | --------------------------------------------------------------------------------------------------------- | ---------- | ----- |
-| [Installing and Running Python](https://foundations.projectpythia.org/foundations/how-to-run-python.html) | Helpful    |       |
+| [Installing and Running Python](https://foundations.projectpythia.org/foundations/how-to-run-python) | Helpful    |       |
 
 - **Time to learn**: 20 minutes