Add contributor how-to: Editing keybindings

[mfisher87]

Description

Add documentation to help contributors edit keybindings

Checklist

• PR has a descriptive title and content.
• PR description contains references to any issues the PR resolves, e.g. Resolves #XXX.
• PR has one of the labels: documentation, bug, enhancement, feature, maintenance
• Checks are passing.
  Failing lint checks can be resolved with:
  • pre-commit run --all-files
  • jlpm run lint

---

📚 Documentation preview: https://jupytergis--586.org.readthedocs.build/en/586/
💡 JupyterLite preview: https://jupytergis--586.org.readthedocs.build/en/586/lite

[github-actions]

👈 Launch a Binder on branch mfisher87/jupytergis/contributor-tutorial

[mfisher87]

Would appreciate some input :)

[arjxn-py]

The selector field defines which elements the keybinding applies to.
This ensures that the keybinding only applies when a relevant JupyterGIS UI component is in focus.
For JupyterGIS, we typically use:

.data-jgis-keybinding

because we've added this css class to the application shell here.
You'll notice when you click outside JupyterGIS (e.g., on JupyterLab’s top menu), the keybindings will no longer work. However, clicking back inside JupyterGIS will reactivate them.

[mfisher87]

Wonderful, thank you for the extra context :D

[github-actions]

Integration tests report: appsharing.space

[arjxn-py]

I'm rebasing the branch to also trigger CI

[arjxn-py]

No idea why RTD is failing, however lite ui tests should be fixed after #589 hopefully

[mfisher87]

 looking for now-outdated files... /home/docs/checkouts/readthedocs.org/user_builds/jupytergis/checkouts/586/docs/contributor_guide/index.md:8: WARNING: toctree contains reference to nonexisting document 'contributor_guide/tutorials' [toc.not_readable]
/home/docs/checkouts/readthedocs.org/user_builds/jupytergis/checkouts/586/docs/contributor_guide/tutorials/index.md:3: WARNING: toctree glob pattern '*/*' didn't match any documents
none found
pickling environment... done
/home/docs/checkouts/readthedocs.org/user_builds/jupytergis/checkouts/586/docs/contributor_guide/tutorials/index.md: WARNING: document isn't included in any toctree [toc.not_included]
checking consistency... /home/docs/checkouts/readthedocs.org/user_builds/jupytergis/checkouts/586/docs/contributor_guide/tutorials/keybindings.md: WARNING: document isn't included in any toctree [toc.not_included] 
 /home/docs/checkouts/readthedocs.org/user_builds/jupytergis/checkouts/586/docs/contributor_guide/tutorials/keybindings.md:28: WARNING: Lexing literal_block '  {\n      "command": "jupytergis:identify",\n      "keys": ["I"],\n      "selector": ".data-jgis-keybinding"\n  },\n' as "yaml" resulted in an error at token: ','. Retrying in relaxed mode. [misc.highlighting_failure] 

I'll work on this in a little while :)

[mfisher87]

Don't show h2 headings, only show document titles. To a depth of 2.

[mfisher87]

Hope y'all don't mind a YOLO merge on these docs PRs. I'd like to make these available to contributors ASAP so we can get feedback from new contributors trying these tasks for the first time.