Merge branch 'develop'

* develop: (440 commits)
  Create cache volume to save getpdf results between sessions.
  Add Brotli compression
  Re-add 2019 to domain suffix
  Tweak fix for enote/dtu-enote-website/issues/232
  Move scripts to ./scripts.
  Add fix for enote/dtu-enote-website/issues/232
  test for headless chrome
  Update url for real 2019 production server
  Fix up verify and monitor; start “real” tests with minitest
  Add submodule update to CI
  fix typo
  Updates for release/production deployment
  Add CI for new 2019 deployment server.
  Remove chat from nginx
  Remove dependency hash stuff since now we use git submodules
  Fix gem path
  Move to gitsubmodules for dtu-core dependencies
  Set 2019 server info.
  remove local debugging help
  Add redis & environment to filemanager + cleanup
  ...

# Conflicts:
#	.gitlab-ci.yml