push 1.5.3

Officially add config page. Will now starting moving most configuration doing using environment variables into the database. This will allow updating settings without restarting and make it easier to do.
Have move a lot more settings from environment variables to database, and "flipped" the logic to prefer settings from environment variables. hence, now we use environment to force a setting, where db settings used to override environment variables.

minor updates to website ( show if agent has a non free plan, add more links across different pages for easier navigation, move a few things around, change styles, fix endless scrolling on some pages etc. )
fix issue with agent's getting from host for grpc url.