Clarify SOGo Integrator in table of contents

mkdocs.yml

@@ -68,7 +68,7 @@ pages:
   - 'Adjust Service Configurations': 'u_e-change_config.md'
   - 'Deinstall': 'u_e-deinstall.md'
 - 'Third party apps':
-  - 'Thunderbird': 'third_party-thunderbird.md'
+  - 'SOGo Integrator for Thunderbird': 'third_party-thunderbird.md'
   - 'Roundcube': 'third_party-roundcube.md'
   - 'Portainer': 'third_party-portainer.md'
   - 'Gogs': 'third_party-gogs.md'