Updated postgraphile online instance references
Prepared exercises for the following two weeks
Added solution placeholders for GraphDB exercises
Updated MongoDBIntro exercises
Updated version, keep artifacts
db-link exercise added to distributed db
updated Optimization exercises
updated Datastructures and Indexes
Updated exercise schedule
palindrome solution corrected
Adjust description of 'projektzuteilen' exercise
Exchanged AngProj database with bank and adapted fn3 example
Prepared exercises for week 2
Prepared exercises of first week
Extended exercise solutions
corrected exercise title
removed duplicated document title
corrected link to final exercise on overview page
Final data engineering exercise
graphql exercise updated to point to usable DMZ ports