Add destroy action to admin budget controller

app/controllers/admin/budgets_controller.rb

@@ -42,6 +42,15 @@ class Admin::BudgetsController < Admin::BaseController
     end
   end
 
+  def destroy
+    if @budget.investments.any?
+      redirect_to admin_budgets_path, alert: t('admin.budgets.destroy.unable_notice')
+    else
+      @budget.destroy
+      redirect_to admin_budgets_path, notice: t('admin.budgets.destroy.success_notice')
+    end
+  end
+
   private
 
     def budget_params