Gather user feedback via form on stage and missions pages

[philhawksworth]

In order to get valuable feedback from the users, we should display a simple feedback form on selected pages. The form on each page of the docs site is a good reference:

Suggested activities

• Decide which pages should get such a form (Stage template? Mission completed page?)
• Design the form
• Decide destination for data (talk to docs team for their insights from experience)
• Implement API
• Implement UI

[sdras]

This one will probably be done by @bencodezen or at the very least please coordinate with him :) thanks!