[Improvement] Add the connector directory classification in the document navigation

### What would you like to be improved?

It would be better to add connector directory classification in document navigation.

### How should we improve?

_No response_

Start by locating the document navigation configuration and the connector directory documentation. Determine how existing directories are classified, then add the connector directory classification and verify that it appears correctly in the navigation.

Written by the indexing model from the issue text.