Fix timeline grouping labels (#2146)
Update CHANGELOG.md
Removes superfluous css file
Merges sass rules
Fixes low contrast for inactive calendar days
Adds changelog entry
Merge pull request #805 from opf/fix/accessibility_low_contrast_calendar_view_2229

[FIX] Accessibility low contrast calendar view 2229
Fix event type retrieval in work packages activity provider (#3723)
Add change log entry (#3723)
Wrap up activity provider spec in describe block (#3723)
Merge pull request #804 from opf/fix/work-package-event-types-3723
Merge pull request #800 from opf/fix/accessibility-timeline-grouping-labels-2146