Delete unnecessary navigator delay

[marinaaisa]

Bug/issue #141189589, if applicable:

Summary

Delete unnecessary navigator delay. It was legacy code that is no longer in need.

This is the commit that introduced the delay-hiding transition in 2022.
It was intended to delay closing the navigator, so the transitions we have for the NavigatorCard would still work and we would also prevent keyboard navigation for AX reasons.

Dependencies

NA

Testing

Steps:

1. Run the project with a .doccarchive
2. Go to any documentation page
3. Assert that the navigator is loading without any delay

Checklist

Make sure you check off the following items. If they cannot be completed, provide a reason.

• Added tests
• Ran npm test, and it succeeded
• Updated documentation if necessary