- Introduce `send_admin_note.js` for sending community announcements to Nostr relays.
- Implement `send_test_note.js` for testing note sending with specified private key and relay URL.
- Enhance `NostrFeed.vue` to filter notes based on admin pubkeys and display appropriate titles and descriptions for different feed types.
- Update `Home.vue` to use the announcements feed type for the Nostr feed component.
