Add hook to clean up YAML files

[dhruvkb]

Fixes

Fixes #410 by @dhruvkb

Description

This PR adds a new pre-commit hook to format YAML files.

Testing Instructions

Formatting changes are adequately tested by passing lint check.

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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[AetherUnbound]

Looks good! Do we want to add this to the main Openverse repo?

[dhruvkb]

@AetherUnbound WordPress/openverse#131