feat(legacy): add db config defaults and allow custom port (#1559)

* feat(legacy): allow custom port for database connection

- fix heredoc for php72

* update test config db section

* update sample config db section

* update api db config

* use defaults for database config section

* update documentation

* more documentation for migration

docs/_docs/host-configuration.md

@@ -16,9 +16,10 @@ You can also set options for RabbitMQ messaging and the LibreTime server in this
 
     [database]
     host = localhost
-    dbname = airtime
-    dbuser = airtime
-    dbpass = airtime
+    port = 5432
+    name = libretime
+    user = libretime
+    password = libretime
 
     [rabbitmq]
     host = 127.0.0.1