Part 1 of the new restrictions menu changes.
Start at rewriting the JS for the new prefer/restrict model.
So btn-group exists. Let's use that.
Clean up a couple doc comments.
Functional buttons that move items in and out of pref/restrict lists.
Plus sign instead of checkmark.
Merge branch 'split-prefs'
Fix the navbar up top.
Add save and proceed buttons.
Merge branch 'master' of github.com:evanthebouncy/foodaware