Upgrade to latest Picnic codebase
Merge branch 'master' of github.com:vanillaforums/VanillaDocs

* 'master' of github.com:vanillaforums/VanillaDocs:
  Add: dev intro
  Add: dev/configuration
  rm config files
  Add: Groups
  Cleanup addons folder
  Add: Reactions

Conflicts:
	features/addons/groups/adding-and-editing-groups.md
	features/addons/pockets/index.md