rewrite most code; removes database to solely rely on config file

config.example.toml

@@ -1,6 +1,9 @@
-[database]
-host = "127.0.0.1"
 port = 5432
-user = "username"
-pass = "password"
-name = "database"
+
+[[rrconfig]]
+username = "username"
+password = "password"
+nameserver = "ns1.example.org"
+zonename = "example.org"
+hostname = "somerecord.example.org"
+tsigkey = "<tsig-key>"