[BB-3971] Improve navigation page
Created by: giantas
Description This PR implements a couple of improvements to the theme navigation page:
- Renames the page and adds a description about it
- Sets default colors for the unset fields
- Removes the Navigation links heading
- Removes the user dropdown color input field
- Adds a tooltip to each field
- Renames the labels of the input fields
Supporting information Gitlab issue
Testing instructions
- Sign in to the console
- Navigation to the Theme > Navigation page
- Review the Gitlab issue and confirm each item is implemented as described.
Deadline
End of sprint BB.243