db to config file

moved quite a bit of config options to config file from db, not much left in the site configuration page now

follow the commits to see the work

NOTE: no liquibase migrations provided as we're getting rid of the db anyway, this will let us roll back in case we need to
As a side note - I am planning to follow up with another PR for the rest of the stuff that's left in config. Will probably remove the current `this.appConfig` variable.