Add meta description for documentation index page

[dhruvkb]

Fixes

Fixes #4967 by @zackkrida

Description

This PR adds a meta description for our docs home page. A similar process can be applied to any page whose auto-generated meta description is unsatisfactory.

Testing Instructions

0. Check out the PR and start the Sphinx server: just s
1. View the source of the home page.
2. You should see the <meta> tag in the page header, that was not there before.

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 (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

Developer Certificate of Origin

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Developer's Certificate of Origin 1.1

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(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
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    in the file; or

(c) The contribution was provided directly to me by some other
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    this project or the open source license(s) involved.

[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/5163

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Changed files 🔄:

• https://docs.openverse.org/_preview/5163/index.html

[krysal]

Great 👌