Fix walking templates
Bump Go version and fix modfiles
Update to use new io/fs package
.github: auto close PRs and mirror from SourceHut
Fix odd formatting in docs
Return errors from renderer

Now that this is public let the application handle errors from the
renderer instead of logging them.
Future-proof the SetFlash API
.builds: add builds.sr.ht CI config
Minor update to docs
Remove unused assetsfs
Remove AtomRenderer
Remove InternalServerErrorRenderer
Use a distinct type for flash messages
Initial public release