Added tests for non-happy paths for recommender, report services and findByUsername and findByTitle functions.

Milestone-3

See merge request !38

Resolve "Documentation"

See merge request !37

# Conflicts:
#	report/src/main/java/cz/muni/fi/pa165/ReportApplication.java
#	report/src/main/java/cz/muni/fi/pa165/ReportService.java

Resolve "Add tests for new core endpoints"

See merge request !36

Resolve "Monitoring dashboard (Grafana)"

See merge request !34

Added authorization to project

See merge request !33

Resolve "Maven dependencies cleanup"

See merge request !32

1st part of pom cleanup. Old unused dependencies left as comments. Check swagger dependencies left to do.

Resolve "Create report module"

See merge request !31