[Docs Rewrite] Meta-Issue: Other Content

[markerikson]

This is a tracking issue to cover all work related to updating the "Other" section, as well as any other bits of content.

Tasks

• [x] Drop the "Feedback" page (#3623)
• [ ] Add a "Testimonials" page (#3294 )
• [ ] Rethink the "Troubleshooting" page