collections:
  activities:
    output: true
    permalink: /:collection/:name/
  groups:
    output: true
    permalink: /:collection/:name/
  people:
    output: true
    permalink: /:collection/:name/

collections:
  activities:
    output: true
    permalink: /:collection/:path/
  groups:
    output: true
    permalink: /:collection/:path/
  people:
    output: true
    permalink: /:collection/:path/

Change collection permalink scheme to use :path.
Change collection permalink scheme to use :path.
