refactoring welcome screen
Merge branch 'master' of github.com:michaelknoch/de.htwg.wt.go

* 'master' of github.com:michaelknoch/de.htwg.wt.go:
  responsive scaling

Conflicts:
	public/css/main.css
Merge branch 'master' of github.com:michaelknoch/de.htwg.wt.go

* 'master' of github.com:michaelknoch/de.htwg.wt.go:
  60 to 100 percent cell size
  add refactor

Conflicts:
	public/css/main.css