show link to Discourse in navbar if Discourse SSO is enabled.

discourse_sso/context_processors.py

@@ -0,0 +1,4 @@
+from django.conf import settings
+
+def discourse_sso_origin(request=None):
+    return {'DISCOURSE_SSO_ORIGIN': settings.DISCOURSE_SSO_ORIGIN}

hive/settings.py

@@ -115,6 +115,7 @@ TEMPLATE_CONTEXT_PROCESSORS = (
     "django.contrib.messages.context_processors.messages",
     "hive.context_processors.origin",
     "hive.context_processors.site",
+    "discourse_sso.context_processors.discourse_sso_origin",
 )
 
 if GA_TRACKING_ID:

hive/templates/base.html

@@ -22,6 +22,7 @@
     <div class="collapse navbar-collapse" id="navbar-collapse">
       <ul class="nav navbar-nav">
         <li><a href="{% url 'mentoring.views.index' %}">Expertise Exchange</a></li>
+        {% if DISCOURSE_SSO_ORIGIN %}<li><a href="{{ DISCOURSE_SSO_ORIGIN }}">Discourse</a></li>{% endif %}
         <li><a href="{% url 'faq' %}">FAQ</a></li>
       </ul>
       <ul class="nav navbar-nav navbar-right">