Signet version 0.9.20 release notes

### New features

### Enhancements

- Made the client compatible with screen readers #37
- Added more developer documentation #40
- Updated device autodetection for changes in Debian 12 #41
- Search looks at group names in addition to just account names #38
- When upgrading firmware, only show files with firmware correct extensions #33

### Bug fixes

- Fixed the default backup filename #35
- Now able to open a backup file when you don't have your device signet-base#10
