Split Help page into Trial Mode and Pricing pages

- Add routes
- Add footer links
- Make heading size consistent on Cookies page

app/templates/admin_template.html

@@ -84,7 +84,8 @@
         <div class="column-one-third">
           <h2>About</h2>
           <ul>
-            <li><a href="{{ url_for("main.help") }}">Help</a></li>
+            <li><a href="{{ url_for("main.trial_mode") }}">Trial mode</a></li>
+            <li><a href="{{ url_for("main.pricing") }}">Pricing</a></li>
             <li><a href="{{ url_for("main.terms") }}">Terms of use</a></li>
             <li><a href="{{ url_for("main.cookies") }}">Cookies</a></li>
           </ul>