Groups and headings CRUD from budget view

Before, users needed to navigate to the list of groups in order to
add, edit or delete a group.

Also, they need to navigate to the list of groups first, and then to
the list of headings for that group in order to add, edit or delete a
heading.

Now, it's possible to do all these actions for any group or heading
from the participatory budget view to bring simplicity and to reduce
the number of clicks from a user perspective.

Co-Authored-By: Javi Martín <javim@elretirao.net>

spec/components/admin/budgets/table_actions_component_spec.rb

@@ -4,12 +4,11 @@ describe Admin::Budgets::TableActionsComponent, controller: Admin::BaseControlle
   let(:budget) { create(:budget) }
   let(:component) { Admin::Budgets::TableActionsComponent.new(budget) }
 
-  it "renders actions to edit and delete budget, manage investments and edit groups and manage ballots" do
+  it "renders actions to edit and delete budget, manage investments and manage ballots" do
     render_inline component
 
-    expect(page).to have_link count: 4
+    expect(page).to have_link count: 3
     expect(page).to have_link "Investment projects", href: /investments/
-    expect(page).to have_link "Heading groups", href: /groups/
     expect(page).to have_link "Edit", href: /#{budget.id}\Z/
     expect(page).to have_link "Preview", href: /budgets/