v1.6.0

changelog:

- overhaul and simplify login experience
- add `account` api with `login`, `logout` and `export-keys` cmds
- add sign up feature targeted at users new to nostr
- support nip05 addresses in nostr git urls eg. `nostr://dan@gitworkshop.dev/ngit`
- rework `ngit init` to make on-boarding more intuitive with simplier questions and more guidance and prompting to setup nostr remote
- don't create `maintainers.yaml` for new repos but continue to support it for projects that already use it
- remove ngit `pull`, `push` and `fetch` api to nudge users to use native git cmds with git plugin
- expend merge types that automatically update PR status when pushed
- various fixes: eg `ngit accountlogin` from outside of a git repository, add QR code border, and make `ngit list` prompts more intuitive
- bump dependancies eg rust-nostr to v0.37