chore: implement changes from linters, update copyright years

feat: manual updating of A records

feat: apikey refreshing and eye toggle

fix: a possible flaw to delete domains owned by others

fix: check A record in update api, move check to func

feat: domains admin view

feat: some logging improvements

feat: logout

feat: check that domains are only ascii letters and numbers

feat: don't allow full stops in domains

feat: ability to update user email and password, and delete user

fix: typo in error

refactor: move more to handlers

refactor: directory layout