Improved question text

Simplified structure of geometries example

Minor changes for better readability

Added missing datastruct collection databases folder

Updated datastructures exercises

Triggers exercises updated and finer grained

Applied fix to or-mapping solutions

- reformatted code and documentation

corrected definition of footnote attribute

increased artifacts expiry timeout

Updated exercises of week 4 and restructured documents

New release solves missing updates in docs

correction of stored procedure templates

Updated exercises for week 3

Reduced text duplications using attributes and includes

- corrected image links when viewing on gitlab
- corrected link to solutions branch on gitlab
- added intellij projects

added note on JRE/JDK max version to use

corrected command to import data

updated to postgres 12

adjusted year of term and overview page

Prepared for last exercise

- updated solutions and conclusions of other exercises