Remove back to all templates link

The all templates page is linked to from the navigation, and clutters
up this footer area of the template page, which now has some extra info.

app/templates/views/templates/template.html

@@ -22,9 +22,4 @@
     {{ api_key(template.id, name="Template ID", thing='template ID') }}
   </div>
 
-  {{ page_footer(
-    secondary_link=url_for('.choose_template', service_id=current_service.id),
-    secondary_link_text='All templates'
-  ) }}
-
 {% endblock %}