Add pizza order button to the event detail

Gijs Hendriksenrequested to merge
34-order-pizza-in-event-view into master

Closes #34

Short description

This adds a button to order pizza to the event detail of events where pizza can be ordered.

pizza

Steps to use this feature

  1. Open an event for which you can order pizza.
  2. Press the "Bestel" button.
  3. ..?
  4. Pizza!

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