Add HTTPS doc to table of contents, fix warning

[AetherUnbound]

Description

This PR fixes an issue I noticed in #678 where the https.md guide was not showing in the table of contents. It also corrects a warning that had shown up in the sphinx output:

building [html]: targets for 2 source files that are out of date
updating environment: 0 added, 2 changed, 0 removed
reading sources... [100%] guides/publish                                                                                                                                                                            
looking for now-outdated files... none found
pickling environment... done
checking consistency... /api/docs/guides/https.md: WARNING: document isn't included in any toctree     <-- here
done
preparing documents... done
writing output... [100%] index                                                                                                                                                                                      
/api/docs/guides/publish.md:3: WARNING: 'myst' reference target not found: ghcr.io     <-- and here
generating indices... genindex py-modindex done
writing additional pages... search done
copying images... [100%] _static/publish_action_example.png                                                                                                                                                         
copying static files... done
copying extra files... done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded, 2 warnings.

The HTML pages are in build/html.

Screenshots

Before

After

Testing Instructions

1. (Optionally) Check out main, run just sphinx-make && just sphinx-serve, visit http://0.0.0.0:3001/guides/index.html and observe that Testing HTTPS does not show up.
2. On this branch, run just sphinx-make && just sphinx-serve, visit http://0.0.0.0:3001/guides/index.html and observe that Testing HTTPS does show up.
3. Also, observe that the two above warnings no longer appear when running just sphinx-make.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

Developer Certificate of Origin

Developer Certificate of Origin

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(b) The contribution is based upon previous work that, to the best
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[zackkrida]

👍