Improve feedback mechanism

[graue]

We currently use a Google Form for feedback, and at some point between when we created the form and now, Google started making people sign into a Google account to submit the form. We can't disable this.

Also, it still inaccurately says "private beta." And we don't regularly check the feedback.

It would be good to have a feedback mechanism that:

• Doesn't require signing into a Google account
• Doesn't say "private beta"
• Is easier to check or ideally pushes new feedback to active developers somehow
• Is provided while viewing specific routes and sends us that context, maybe even allowing selecting a particular step to flag