Replace unsplash images with picsum

docs/figures.md

@@ -23,12 +23,12 @@ Adding an image to your notebook using the standard Markdown syntax will work as
 By switching to MyST Directives or figures (and images) can be inserted with some additional control. `figure`s can also be cross-referenced in other places in the notebook. For example, the following `figure`:
 
 ```{myst}
-:::{figure} https://source.unsplash.com/random/400x200?beach,ocean
+:::{figure} https://picsum.photos/seed/myst-101/400/200
 :name: myFigure
-:alt: Random image of the beach or ocean!
+:alt: Image of a peer by the ocean
 :align: center
 
-Randomized beach and ocean images from Unsplash 🏖
+Ocean image from Lorem Picsum 🏖
 :::
 
 Check out [](#myFigure)!!

docs/index.md

@@ -72,7 +72,7 @@ jupyter labextension disable jupyterlab-myst:executor
 
 ### Trust 🕵️‍♀️
 
-Jupyter Notebooks implement a [trust-based security model](https://jupyter-notebook.readthedocs.io/en/stable/security.html). With the addition of inline expressions, Markdown cells are now considered when determining whether a given notebook is "trusted". Any Markdown cell with inline-expression metadata (with display data) is considered "untrusted". Like outputs, expression results are rendered using safe renderers if the cell is not considered trusted.
+Jupyter Notebooks implement a [trust-based security model](https://jupyter-server.readthedocs.io/en/stable/operators/security.html). With the addition of inline expressions, Markdown cells are now considered when determining whether a given notebook is "trusted". Any Markdown cell with inline-expression metadata (with display data) is considered "untrusted". Like outputs, expression results are rendered using safe renderers if the cell is not considered trusted.
 Executing the notebook will cause each cell to be considered trusted.
 
 To facilitate this extension of the trust model, the `jupyterlab_myst` server extension replaces the `NotebookNotary` from `nbformat` with `MySTNotebookNotary`. This can be disabled with

examples/myst_tests.md

@@ -32,26 +32,26 @@ math:
 This is MyST in a notebook rendered by `jupyterlab-myst`!!
 :::
 
-```{figure} https://source.unsplash.com/random/800x200?sunset
+```{figure} https://picsum.photos/800/200
 :name: hello
 :width: 40%
-A nice sunset 🌅!!
+A random 800x200 image
 ```
 
-```{figure} https://source.unsplash.com/random/800x200?beach,ocean
+```{figure} https://picsum.photos/seed/myst-003/800/200
 :name: fig4
 :width: 40%
-Relaxing at the beach 🏖
+Image of a wolf 🐺
 ```
 
 This chart shows an example of `using` an interval **selection**[^1] to filter the contents of an attached histogram, allowing the user to see the proportion of items in each category within the selection. See more in the [Altair Documentation](https://altair-viz.github.io/gallery/selection_histogram.html)
 
 [^1]: Footnote text
 
-```{figure} https://source.unsplash.com/random/800x300?beach,ocean
+```{figure} https://picsum.photos/seed/myst-013/800/300
 :name: fig3
 :width: 80%
-Relaxing at the beach
+A rocky coastline
 ```
 
 ```{math}
@@ -84,7 +84,7 @@ For example, this equation:
 \mathbf{u} \times \mathbf{v}=\left|\begin{array}{ll}u_{2} & u_{3} \\ v_{2} & v_{3}\end{array}\right| \mathbf{i}+\left|\begin{array}{ll}u_{3} & u_{1} \\ v_{3} & v_{1}\end{array}\right| \mathbf{j}+\left|\begin{array}{ll}u_{1} & u_{2} \\ v_{1} & v_{2}\end{array}\right| \mathbf{k}
 ```
 
-<div><img src="https://source.unsplash.com/random/800x300?beach,ocean" width="100px"></div>
+<div><img alt="A random 800x300 image" src="https://picsum.photos/800/300" width="100px"></div>
 
 <!-- just a comment! -->