Enable ability to disable tickets menu item

Add Ansible variable that enables removing the "Tickets" menu item.
Update the Ansible template that is used to generate the base Pretalx
template (see #1162) to support this new variable.

Author: martey

ansible/group_vars/all

@@ -11,6 +11,7 @@ email_host_user: [email protected]
 email_host_password: ""
 git_version: main
 gunicorn_port: 10501
+nav_tickets_enabled: true
 project_root: "/srv/pydata"
 postmark_api_token: ""
 ssl_enabled: false

ansible/roles/web/templates/pretalx/common/base.html

@@ -96,7 +96,7 @@ <h1>
                     </div>
                     <a class="nav-link" href="{{ content_site }}/job-board/">Job Board</a>
                     <a class="nav-link" href="{{ content_site }}/sponsors/">Sponsor</a>
-                    <a class="nav-link" href="{{ content_site }}/tickets/">Tickets</a>
+                    {% if nav_tickets_enabled %}<a class="nav-link" href="{{ content_site }}/tickets/">Tickets</a>{% endif %}
                     <a class="nav-link" href="{{ content_site }}/schedule/">Schedule</a>
                 </nav>
 {% raw %}