Merge dashboard and dashboard-backend repos

To do

  1. Merge the back-end code into this repository (!55 (merged))
  2. Tag the merged versions and make sure a tagged container image is built for the front-end and back-end
  3. Use the new tagged images in the helm chart, update the back-end container repository to the correct one.
  4. Move all relevant issues from the back-end repo to this repo
Edited by Maarten de Waard
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