CHANGE: Minor improvements + updated api docs

Docker/docker-compose.yml

@@ -13,6 +13,8 @@ services:
     volumes:
       - ${POSTGRES_PATH}:/var/lib/postgresql/data
       - ${POSTGRES_PATH}/initdb:/docker-entrypoint-initdb.d
+    ports:
+      - 5432:5432
 
   backend:
     image: git.letsstein.de/tom/arbeitszeit-backend