Description

Adds YT link to docs footer

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Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Added a YouTube link to the docs footer socials (via docs/docs.json) so readers can easily find our channel.

^{Written for commit ac3dc61. Summary will update automatically on new commits.}