feat: atproto support #12

Merged zeu.dev
targeting main from feat/atproto
Merged opened by and assigned to zeu.dev
targeting main from feat/atproto

Made as part of Web Dev Challenge episode sponsored by Bluesky.

Implements new atproto utility functions using microcosm.blue services, ATProtoFans supporters and You & Me connections displays, and initial Streamplace integration.

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