Figure out what do do with notes

[staab]

• [x] People should probably more of a search page, rather than a feed-like page
• [ ] Remove network tab, no need for follow-based feeds
• [ ] The threads section of a space should be for content on a relay
• [ ] Single-relay instances may set a custom feed to showcase on the threads section
• [ ] Add a menu item to share a thread/comment to a chat room
• [ ] When creating a thread, allow the user to share to a given room