Move automations into their own directory; update README

[zackkrida]

Fixes

Fixes #196 by @zackkrida

Description

This PR move automation scripts and their config files into a top-level automations/ directory. This could relate to potentially moving to a monorepo as discussed in #192, but also helps generally separate concerns and clean up the repo.

Also adds a readme for the new automations folder that includes info about requirements and installing dev dependencies.

Testing Instructions

Checklist

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• 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.

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[sarayourfriend]

Thanks for adding this, but should we use the same version as on the frontend (v16)?

[zackkrida]

I thought so too initially but I think for now it's better to match the version of the actions themselves, which is Node 14. We could update those to 16 potentially, if GitHub supports it!

[zackkrida]

Moved the justfile back to the root and updated its paths.

[zackkrida]

@WordPress/openverse-developers could someone help me with the lint issue in this PR? I'm having a difficult time seeing what the problem is.

[dhruvkb]

Looks great. Very neatly organised.

[AetherUnbound]

Looks great! I love it 😄