Add tidy_raw() helper

lib/outlook_web/view_helpers.ex

@@ -0,0 +1,12 @@
+defmodule OutlookWeb.ViewHelpers do
+
+  import Phoenix.HTML, only: [raw: 1]
+
+  @doc "Just sanitize tags"
+  def tidy_raw(html) do
+    html
+    |> Floki.parse_fragment!()
+    |> Floki.raw_html()
+    |> raw
+  end
+end