First public relase of Alps

First release of the long overdue Alps webmail. At Migadu, we've never prioritized webmail as we consider webmail to be a poor replacement for a standalone email clients. However we've been proven otherwise by our users and great Email Room at FOSDEM. With additional push from NLNET, we've given a fresh new eyes to the project.

We've moved to an API based architecture with a SPA backend based on web components and Lit, a very simple and maintainable setup, built for rapid development.

This release includes all expected features of a modern webmail, including a revamped plugin system.

• We've moved to a pluggable provider architecture meaning Alps is not stuck to IMAP only. Included providers: IMAP and Maildir (experimental)
• Included plugins: CardDAV, CalDAV, ManageSieve with an UI composer, simple GPG.
• Base system has been extended with WebAuthn and Account Switching

Going forward, this Github repo will be the primary repo for Alps development.