Refactor participatory budgets in draft mode

Previously the draft mode was a phase of the PB, but that had some
limitations.

Now the phase drafting disappears and therefore the PB can have the
status published or not published (in draft mode).

That will give more flexibility in order to navigate through the
different phases and see how it looks for administrators before
publishing the PB and everybody can see.

By default, the PB is always created in draft mode, so it gives you
the flexibility to adjust and modify anything before publishing it.

app/controllers/admin/budgets_controller.rb

@@ -15,6 +15,7 @@ class Admin::BudgetsController < Admin::BaseController
   end
 
   def show
+    render :edit
   end
 
   def new
@@ -23,6 +24,11 @@ class Admin::BudgetsController < Admin::BaseController
   def edit
   end
 
+  def publish
+    @budget.publish!
+    redirect_to edit_admin_budget_path(@budget), notice: t("admin.budgets.publish.notice")
+  end
+
   def calculate_winners
     return unless @budget.balloting_process?
 
@@ -42,9 +48,9 @@ class Admin::BudgetsController < Admin::BaseController
   end
 
   def create
-    @budget = Budget.new(budget_params)
+    @budget = Budget.new(budget_params.merge(published: false))
     if @budget.save
-      redirect_to admin_budget_path(@budget), notice: t("admin.budgets.create.notice")
+      redirect_to edit_admin_budget_path(@budget), notice: t("admin.budgets.create.notice")
     else
       render :new
     end