Resolve "Check generation of regular timetable"

Closes #124

See merge request !153

Resolve "Update copyright"

Closes #133

See merge request !160

Resolve "Missing migrations"

Closes #132

See merge request !159

Merge branch '131-print-button-uses-default-browser-print-dialogue-before-redirecting' into 'master'

Resolve "Print button uses default browser print dialogue before redirecting"

Closes #131

See merge request !158

Resolve "Review permissions"

Closes #83

See merge request !113

Resolve "Django 3.2 database improvements"

Closes #125

See merge request !150

Bump version to 2.0a5

See merge request !157

Update poetry.lock

See merge request !156

Resolve "PDF export for timetables"

Closes #51

See merge request !77

Resolve "Show print timetable button on mobile devices"

Closes #130

See merge request !154