cleanup: Move old compose example to devtools directory

We agreed to move the 'opencloud_full' example to a new directory to
avoid confusion with the supported compose examples in
opencloud-compose.

This commit keeps the bare-metal example in place as that is still
mentioned in the documentation.

devtools/deployments/opencloud_full/web_extensions/jsonviewer.yml

@@ -0,0 +1,15 @@
+---
+services:
+  opencloud:
+    depends_on:
+      jsonviewer-init:
+        condition: service_completed_successfully
+
+  jsonviewer-init:
+    image: opencloudeu/web-extensions:json-viewer-1.0.0
+    user: root
+    volumes:
+      - opencloud-apps:/apps
+    entrypoint:
+      - /bin/sh
+    command: ["-c", "cp -R /usr/share/nginx/html/json-viewer/ /apps"]