This reverts commit 72c9a602.

into development and additional clean up

Conflicts:
	src/main/java/at/ac/uibk/gitsearch/service/GitlabService.java
	src/main/webapp/app/app-routing.module.ts
	src/main/webapp/app/exercise/service/exercise.service.ts
	src/main/webapp/app/search/search-input/search-input.component.ts
	src/main/webapp/app/shared/model/exercise.model.ts

Resolve "editorial pages"

See merge request sharing/codeability-sharing-platform!59

# Conflicts:
#   src/main/resources/.h2.server.properties
#   src/main/webapp/app/exercise/service/exercise.service.ts

Resolves #162 and #171

See merge request sharing/codeability-sharing-platform!58