Replace fixed contacts in UI with data from Contacts API

[marsbergen]

Context

To create the MVP we initially hardcoded the contacts in the UI. Now the MVP is validated, we need to fetch the data from the API.

Technical Requirements

• Connect the Contacts list in the frontend with the Contacts API endpoint.
• Make sure all phone numbers are formatted correctly so they won’t break the call button
• Use the Contacts model which already contains the contact list
• Create an API on [GET] /contacts which returns a JSON response with the following fields:
  • (full) name
  • avatar
  • phone
  • email