Bluesky app fork with some witchin' additions 💫

bskyweb: add security.txt

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bskyweb/static/.well-known/security.txt
··· 1 + Contact: mailto:security@bsky.app 2 + Preferred-Languages: en 3 + Canonical: https://bsky.app/.well-known/security.txt 4 + Acknowledgements: https://github.com/bluesky-social/atproto/blob/main/CONTRIBUTORS.md