[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

• Drop the "Feedback" page ([Docs Rewrite] Remove "Feedback" page #3623)
• Add a "Testimonials" page (Add a "Testimonials" docs page #3294 )
• Rethink the "Troubleshooting" page