Add grouping by group (team)

Add grouping by group (team)

Addresses #72 (closed).

Use more complete group map

Remove empty string paths

Remove non-existent group

There's already a group::unknown fallback for paths without a corresponding group.

Sort paths, and remove duplicate paths

Fail CI when paths have multiple groups

Use stricter toEqual matcher

Add table for groups

Screenshots

Closes #72 (closed)