Resolve "Feedback Barometer"

Proposed changes

• Add component feedback-barometer
  • add routing and link paths
  • view (icons and bars)
  • logic (click events and update view)

Testing

All

• get to page and see current feedback
• see tooltip by hovering on smiley

Creator

• cant submit feedback

Participant

• should not be see the "Toggle voting" button
• can submit feedback
  • click on the smiley
  • more than once-> no api

Not implemented

• api connection (there is a dummy array)
• "Toggle voting" doesnt work -> no api

Closes #158 (closed)