chore: Pin Ubuntu versions in GitHub Actions

feat: Add --guess-repo option to init command

chore: Tidy up GitHub Actions

docs: Tidy up KeepassXC reference documentation

chore: Remove broken OpenIndiana tests

chore: Exclude Go files from website build

fix: Fix confusing error message when using builtin git to init over SSH

chore: Remove flaky concurrency-hammer test

chore: Tolerate GitHub rate limiting in tests

chore: Avoid partial updates in ArchLinux test