Add first-steps, trouble-shooting, setup pages. This is only meant to be a placeholder for the trouble-shooting page from the documentation.wiki. Please restructure as you see it fit for https://github.com/SwissDataScienceCenter/renga/issues/36.
Add security limitations - related to issue #7
Commit 2:
Fix UML syntax of lineage and data representation - close #13
Commit 1:
Commit 2: