fix image names

stacks/yourls/compose.yaml

@@ -1,7 +1,7 @@
 name: yourls
 services:
   yourls:
-    image: gitea.psi.ch/yourls:latest
+    image: gitea.psi.ch/images/yourls:latest
     container_name: yourls
     restart: always
     depends_on:
@@ -23,7 +23,7 @@ services:
       YOURLS_PASS: ${YOURLS_PASS}
 
   yourls_mariadb:
-    image: mariadb
+    image: docker.io/mariadb:latest
     container_name: yourls_mariadb
     restart: always
     networks: