Changelog & better release process

Better infrastructure around releasing is needed. Right now Flyde has no change log, which sucks. Also, all packages' patch versions are bumped on each push to main, even when they (or a dependency) did not change.

I've tried semantic-release, but it seemed over complicated and lacked mono-repo support.
https://github.com/changesets/changesets is a good next candidate, and if that does work, evolving the existing GH actions script should cut it