Merge pull request #21 from steinmuehle/feature/remove-popup

Disabled popup.
Merge branch 'master' into develop

* master:
  Added google tag manager.
  Added google analytics.
  Added a simaller version of the header image.
  Replaced course schedule with new data.
  Moved header image into its own div.
Fixed slim indentation, which resulted compiling to a blank page.
Fixed indentation.
Housekeeping.
Minor layout fix.