feat: error.tmpl

feat: link management!

docs: relicense to AGPL 3.0, update name to lowercase

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: login and logout with oidc

feat: config

feat: psql with (maybe) working migration system

feat: initial commit