Remove Postgres SSL support, which was not working at the moment and
was preventing flogatt from running on servers without openssl.
We should re-enable SSL support at a later time.
This commit adds several aditional Postgres config options, such
as PORT, USER, DB_NAME and similar. It also relocates the .env
file so that it will be picked up even if flodgat isn't run from
the src/ directory.