Improve budget index info page with classes

app/views/budgets/index.html.erb

@@ -57,13 +57,13 @@
   </div>
 </div>
 
-<div id="budget_info">
+<div id="budget_info" class="budget-info">
   <div class="row margin-top">
     <div class="small-12 column">
 
       <div id="groups_and_headings" class="groups-and-headings">
         <% current_budget.groups.each do |group| %>
-          <h2><%= group.name %></h2>
+          <h2 id="<%= group.name.parameterize %>"><%= group.name %></h2>
           <ul class="no-bullet">
             <% group.headings.order_by_group_name.each do |heading| %>
               <li class="heading small-12 medium-4 large-2">