Merge remote-tracking branch 'origin/feature/community-detection-pipeline' into feature/community-detection-pipeline

- extracted routes into seperate yaml file to avoid code duplication
- created additional security definition for local mode which accepts all tokens
- added endpoint to add a schema with mappings included

exists as long as pod (persistence after restart)

- changed definition of "Node" in roleStageDiscover
- added layer- and node-storage in roleStageDiscover

Removed all code regarding multilayer creation and visualization including unused/deprecated preparations for Porto Meeting.
See branch support/multilayer-graph for original content.