app/components/budgets/groups/index_component.html.erb
<% provide :main_class, "budget-groups-index" %>
<% content_for :canonical do %>
<%= render "shared/canonical", href: budget_groups_url %>
<% end %>
<%= header(before: back_link_to(budget_path(budget))) %>
<%= render Budgets::GroupsAndHeadingsComponent.new(budget) %>