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
`portalConfig = Portal.app.appConfig.portal`?

That's fine, yeah. `this.appConfig` is used in this class in a few other places. Could potentially be cleaned up, however it's a bit out of the scope of this PR I believe.