Update pyproject.toml

See merge request !196

Fix import of supervision substitutions

See merge request !202

Update .dev-js/package.json

See merge request !197

Fix absence creation

See merge request !195

Resolve "Show imported extra lessons and events in substitutions table"

Closes #73

See merge request !194

Fix substitutions import

See merge request !193

Handle existing amends on LessonEvents

See merge request !192

Resolve "Cancel all lessons on group absences"

Closes #72

See merge request !191

Resolve "Events are deleted without reason"

Closes #69

See merge request !190

Migrate to Cursus/Lesrooster

See merge request !166

Update .prettierignore

See merge request !188