Release 0.3.3

### Changed - The repository moved from GitHub to Tangled, at https://tangled.org/sharedcomputer.network/scn-chat. A release is now an annotated tag there whose message holds its changelog section, rather than a GitHub Release. ### Fixed - A chat's menu in the sidebar now puts the keyboard on its first item as it opens, and Escape returns to the button that opened it, as the other menus already did.