Create new user feedback onboarding doc and feedback survey

[kate-rose]

• [x] beta tester invite email
• [x] onboarding guide
• [ ] overview video
• [ ] tutorial video
• [ ] feedback survey

[samvmdev]

Hey Kate, feedback survey draft is here. it's pretty basic, so edits are welcome. Let me know what you think.

[samvmdev]

Feedback onboarding doc draft is here and in progress

[samvmdev]

Onboarding gif:

[kate-rose]

Thanks! Will review and leave comments on the google docs. @tan-zhou would be great to get your comments/any additions on the above as well.