Fix the navigation
Aims to fix errors from mkdocs:
Build errors encountered. Book 'user' in language 'English' was not published. There was a build error: 'MkDocs was unable to build the book. MkDocs command output: INFO - Cleaning site directory
INFO - Building documentation to directory: /var/www/civicrm-docs/var/cache/prod/publishing/publish_user_en_1726708974
INFO - The following pages exist in the docs directory, but are not included in the "nav" configuration:
- searching/searchkit/example-contacts-with-same-type-relationships.md
- searching/searchkit/expiration_date.md
- searching/searchkit/export-import.md
- the-user-interface/search-result-actions.md
[33mWARNING - [0mA relative path to 'searching/searchkit/expires.md' is included in the 'nav' configuration, which is not found in the documentation files
[33mWARNING - [0mDocumentation file 'searching/searchkit/actions.md' contains a link to 'the-user-interface/search-results-actions.md' which is not found in the documentation files.
[33mWARNING - [0mDocumentation file 'the-user-interface/search-result-actions.md' contains a link to 'the-user-interface/organising-your-data/activities.md' which is not found in the documentation files.