Wrap 404s in site template

app/controllers/catch_all_controller.rb

@@ -0,0 +1,5 @@
+class CatchAllController < ApplicationController
+  def catch_all
+    render status: 404
+  end
+end

app/views/catch_all/catch_all.html.erb

@@ -0,0 +1,3 @@
+<h2 class="title title-page">Ooops! The requested page was not found.</h2>
+
+<p><%= link_to('Starting over', root_path) %> may help. If it does not, please <%= link_to('let us know', feedback_path) %>!</p>

config/routes.rb

@@ -22,4 +22,6 @@
 
   get 'item_status', to: 'aleph#item_status'
   get 'debug', to: 'application#debug'
+
+  get '*path', to: 'catch_all#catch_all'
 end

test/integration/catch_all_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class CatchAllTest < ActionDispatch::IntegrationTest
+  test 'handle 404s' do
+    get '/blargh'
+    assert_response :not_found
+  end
+end