theming: Install bootstrap based theme & template
theming: Configure bootstrap based theme & template
contents: Rewrite contribution task list
Merge branch 'maintenance'
Merge branch 'enhancement/theming' into next
theming: Mark task as completed
Merge branch 'enhancement/theming'

Conflicts:
	CONTRIBUTING.md
contents: Correct content errors
contents: Correct literal internal URLs
contents: Correct application HTTP interface names
Merge branch 'maintenance'

Conflicts:
	CONTRIBUTING.md
	app/views/index.scala.html
Merge branch 'master' into next
Revert mistaken correction
Merge branch 'master' into next
scala: Migrate to Scala
scala: Slick mapper & JSON serialization
Merge branch 'enhancement/scala' into next