Clean up about page (#1282)

* Add InstancePresenter to expose site details

* Clean up about controller, use instance presenter

spec/controllers/about_controller_spec.rb

@@ -3,9 +3,16 @@ require 'rails_helper'
 RSpec.describe AboutController, type: :controller do
   render_views
 
-  describe 'GET #index' do
+  describe 'GET #show' do
     it 'returns http success' do
-      get :index
+      get :show
+      expect(response).to have_http_status(:success)
+    end
+  end
+
+  describe 'GET #more' do
+    it 'returns http success' do
+      get :more
       expect(response).to have_http_status(:success)
     end
   end