Add project authors, auto-link GitHub usernames

[AetherUnbound]

Description

This PR makes three primary changes:

• Adds a field for the author in the project proposal and implementation plan templates
• Backfills author information for all existing project proposals that are present in main
• Adds a very simple and naive extension to Sphinx which converts specific instances of @<username> to links which reference a user's GitHub profile

The upshot of this is that our documentation site now has reviewers and the original author, and all of the @ references are linked to the appropriate GitHub user! This helps provide extra context for folks who may be looking at the documents but not the inciting PRs which created said documents.

Screenshot

Testing Instructions

Check the preview and see how the new project documents look! Also check some other pages to see that there are no erroneous replacements. Here are some examples:

• https://docs.openverse.org/_preview/2066/changelogs/api/2023.04.12.23.29.59.html (should be unchanged)
• https://docs.openverse.org/_preview/2066/meta/documentation/guidelines.html (references to @swagger... shouldn't be replaced)
• https://docs.openverse.org/_preview/2066/meta/documentation/guidelines.html (referencess to @WordPress/maintainers... shouldn't be replaced)
• https://docs.openverse.org/_preview/2066/projects/proposals/analytics/20221006-implementation_plan_frontend.html (there are some @todo references here that shouldn't be replaced)
• https://docs.openverse.org/_preview/2066/projects/proposals/frontend_ui_state_cookie/20220218-project_proposal.html (@defaultValue shouldn't be replaced here)
• https://docs.openverse.org/_preview/2066/projects/proposals/trust_and_safety/detecting_sensitive_textual_content/20230330-implementation_plan_filtering_and_designating_results_with_sensitive_textual_content.html (@task should not be replaced here)
• https://docs.openverse.org/_preview/2066/projects/proposals/visual_regression_testing/20220217-implementation_plan.html (@playwright and @types references shouldn't be replaced)

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate 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.
• I ran the DAG documentation generator (if applicable).

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/2066

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[dhruvkb]

LGTM! This is so good. Our custom extensions deserve to be published to PyPI to benefit the Sphinx ecosystem.

[fcoveram]

I followed the testing instructions and see the notes correctly. If this PR requires more code review, feel free to untag me as a reviewer.

[AetherUnbound]

Thanks so much @fcoveram!

[AetherUnbound]

LGTM! This is so good. Our custom extensions deserve to be published to PyPI to benefit the Sphinx ecosystem.

Lol it being open source is scary enough, I don't need that code on PyPI too 😂 😁