Reverted the default urls.sqlite location

compose.yaml

@@ -9,7 +9,7 @@ services:
             # Change if you want to mount the database somewhere else
             # In this case, you can get rid of the db volume below
             # and instead do a mount manually by specifying the location
-            # - db_url=/opt/urls.sqlite
+            # - db_url=/urls.sqlite
             # Change it in case you want to set the website name
             # displayed in front of the shorturls, defaults to
             # the hostname you're accessing it from
@@ -17,7 +17,7 @@ services:
             - username=admin
             - password=$3CuReP4S$W0rD
         volumes:
-            - db:/opt/urls.sqlite
+            - db:/urls.sqlite
         networks:
             - proxy