sort school categories by root category for Boston

app/views/schools/show.html.haml

@@ -15,6 +15,7 @@
     - hash
   - grouped.each do |root_category, group|
     .row.pt-3.mt-3
+      .col-12
         %h3= root_category.name
     .row
       = render group.sort { |a, b| a.category.name <=> b.category.name }