error codes

lp/lib/lp_web/templates/error/404.html.eex

@@ -0,0 +1 @@
+<h1>404</h1>

lp/lib/lp_web/templates/error/500.html.eex

@@ -0,0 +1,2 @@
+<h1>500</h1>
+<p>There was an error. Sadly.</p>

lp/lib/lp_web/views/error_view.ex

@@ -3,9 +3,13 @@ defmodule LpWeb.ErrorView do
 
   # If you want to customize a particular status code
   # for a certain format, you may uncomment below.
-  # def render("500.html", _assigns) do
-  #   "Internal Server Error"
-  # end
+  def render("404.html", _assigns) do
+    render("404.html", %{})
+  end
+  def render("500.html", _assigns) do
+    render("500.html", %{})
+    # "Internal Server Error"
+  end
 
   # By default, Phoenix returns the status message from
   # the template name. For example, "404.html" becomes