Restructured menu

mkdocs.yml

@@ -30,22 +30,25 @@ pages:
   - 'Sender and receiver model': 'sender_rcv.md'
 - 'Usage & Examples':
   - 'Debugging & Troubleshooting': 'debug.md'
-  - 'mailcow UI Configuration': 'mailcow_ui.md'
+  - 'mailcow UI':
+      - 'Configuration': 'mailcow_ui.md'
+      - 'Blacklist / Whitelist': 'bl_wl.md'
+      - 'Tagging': 'tagging.md'
+      - 'Two-Factor Authentication': 'tfa.md'
   - 'Redis': 'redis.md'
   - 'MySQL': 'mysql.md'
   - 'Rspamd': 'rspamd.md'
+  - 'Postfix':
+      - 'Anonymize Headers': 'anonym_headers.md'
+      - 'Disable Sender Addresses Verification': 'disable_sender_verification.md'
   - 'Why bind9?': 'why_bind9.md'
+  - 'Backup & Restore':
+      - 'Backup Maildir': 'backup_maildir.md'
+  - 'Autodiscover / Autoconfig': 'autodiscover_config.md'
+  - 'Redirect HTTP to HTTPS': '80_to_443.md'
   - 'Adjust Service Configurations': 'change_config.md'
   - 'Customize Dockerfiles': 'cust_dockerfiles.md'
   - 'Docker Compose Bash Completion': 'dc_bash_compl.md'
-  - 'Backup Maildir': 'backup_maildir.md'
-  - 'Two-Factor Authentication': 'tfa.md'
-  - 'Redirect HTTP to HTTPS': '80_to_443.md'
-  - 'Anonymize Headers': 'anonym_headers.md'
-  - 'Tagging': 'tagging.md'
-  - 'Blacklist / Whitelist': 'bl_wl.md'
-  - 'Autodiscover / Autoconfig': 'autodiscover_config.md'
-  - 'Disable Sender Addresses Verification': 'disable_sender_verification.md'
   - 'Deinstall': 'deinstall.md'
 - 'Third party apps':
   - 'Roundcube': 'roundcube.md'