Extract budget form to a component

This way it will be easier to change it and reuse it.

spec/helpers/budgets_helper_spec.rb

@@ -1,14 +0,0 @@
-require "rails_helper"
-
-describe BudgetsHelper do
-  describe "#budget_voting_styles_select_options" do
-    it "provides vote kinds" do
-      types = [
-        ["Knapsack", "knapsack"],
-        ["Approval", "approval"]
-      ]
-
-      expect(budget_voting_styles_select_options).to eq(types)
-    end
-  end
-end