[ cesardeazevedo/nosotros ] Fix replies subscription filter
We can't send #E together with #A in the same filter and some relays
will return only mutually inclusive results.
This commits adds the ability to return multiple filters by query key.
[ zeSchlausKwab/earthly ] docs: update readme with comprehensive project documentation
Add detailed project description, features, tech stack, architecture overview, and setup instructions
Include information about Blossom-hosted PMTiles, geo editor functionality, and Nostr integration
Provide clear installation and development workflow guidance