feat: error.tmpl

feat: link management!

docs: relicense to AGPL 3.0, update name to lowercase

docs: remove old comment

feat: tag management thingy

feat: tab title, tailwind reformat, a todo

feat: some reworks and the first real interaction

* that interaction being the ability to change your display name

feat: create user in db on login

feat: remove login divider, add config option for oidc visual in login

feat: login and logout with oidc