feat(collabora): release collabora

deployment note:
- link to nextcloud
- document opening is verified (including korean fonts)

docs/services/app/collabora.md

@@ -0,0 +1,28 @@
+# Collabora office
+
+## Prerequisite
+
+- Nothing
+
+## Configuration
+
+- Admin page is disabled by Environment options
+    - `admin_console.enable=false`
+
+### Link to nextcloud
+
+- https://nextcloud.ilnmors.com
+    - login with admin account
+
+- Profile: Apps: Nextcloud Office 
+    - Check installation and enable
+
+- Profile: Administration Settings: Nextcloud Office: Your own server
+    - http://host.containers.internal:9980 (collabora container port)
+    - Public FQDN is set automatically
+    - save
+
+- Files
+    - Verify document opening (verified)
+    - The basic font `Noto Sans KR` exists
+        - Korean is presented very well