Extension for Ansible redirects

[oraNod]

Fixes #2147 and supercedes #2266

This PR extends the Sphinx reredirects extension to load redirects for Ansible documentation from a toml file. The purpose is to replace the httpd mod_rewrite rules in https://github.com/ansible/docsite/blob/main/ansible/11/.htaccess and https://github.com/ansible/docsite/blob/main/.htaccess in a way that is compatible with ReadTheDocs.

If this PR is accepted and merged, there are two follow on actions:

• Create a robots.txt file to stop crawlers from indexing the generated HTML files. We can put the robots.txt file in the ansible/docsite repo and copy it across as part of the ReadTheDocs build.
• Remove all the existing stub files from this repository. For example, all the files under the docs/docsite/rst/user_guide folder.

[patchback]

Backport to stable-2.18: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 6d4338a on top of patchback/backports/stable-2.18/6d4338a9234b1c60283c49eb1a00150753e9d085/pr-2418

Backporting merged PR #2418 into devel

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/ansible/ansible-documentation.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/stable-2.18/6d4338a9234b1c60283c49eb1a00150753e9d085/pr-2418 upstream/stable-2.18

4. Now, cherry-pick PR Extension for Ansible redirects #2418 contents into that branch:

   $ git cherry-pick -x 6d4338a9234b1c60283c49eb1a00150753e9d085

   If it'll yell at you with something like fatal: Commit 6d4338a9234b1c60283c49eb1a00150753e9d085 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 6d4338a9234b1c60283c49eb1a00150753e9d085

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Extension for Ansible redirects #2418 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/stable-2.18/6d4338a9234b1c60283c49eb1a00150753e9d085/pr-2418

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to stable-2.19: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 6d4338a on top of patchback/backports/stable-2.19/6d4338a9234b1c60283c49eb1a00150753e9d085/pr-2418

Backporting merged PR #2418 into devel

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/ansible/ansible-documentation.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/stable-2.19/6d4338a9234b1c60283c49eb1a00150753e9d085/pr-2418 upstream/stable-2.19

4. Now, cherry-pick PR Extension for Ansible redirects #2418 contents into that branch:

   $ git cherry-pick -x 6d4338a9234b1c60283c49eb1a00150753e9d085

   If it'll yell at you with something like fatal: Commit 6d4338a9234b1c60283c49eb1a00150753e9d085 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 6d4338a9234b1c60283c49eb1a00150753e9d085

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Extension for Ansible redirects #2418 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/stable-2.19/6d4338a9234b1c60283c49eb1a00150753e9d085/pr-2418

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[oraNod]

Flip, I should have guessed the backports wouldn't get cherry-picked cleanly. Can't blame a dude for trying though.

Edit: PTO brain is a real thing. This doesn't need a backport at all. The publishing workflows are on devel only. 😶‍🌫️

[webknjaz]

This doesn't need a backport at all. The publishing workflows are on devel only. 😶‍🌫️

I tend to still backport supporting configs/automations because this usually helps with future backports layered on top.

[oraNod]

This doesn't need a backport at all. The publishing workflows are on devel only. 😶‍🌫️

I tend to still backport supporting configs/automations because this usually helps with future backports layered on top.

Added a manual backport with #2691