Merge pull request json-schema-org#306 from Relequestual/slack-icon

Changed "discussion" to "join our slack"

Author: handrews

_includes/header.html

@@ -25,9 +25,7 @@
             <a class="page-link" href="{{ my_page.url | relative_url }}">{{ my_page.title | escape }}</a>
             {%- endif -%}
           {% endfor -%}
-          <a class="page-link" href="https://join.slack.com/t/json-schema/shared_invite/enQtNjc5NTk0MzkzODg5LTVlZGIxNmVhMGY2MWFlYTdiNDQ5NWFiZGUwOThhNmYxZDE0YzA5YjRiOTA5MGY4ZTZlZGZhZDFmYTY4NWM2N2Y">
-            Discussion
-          </a>
+          <a class="page-link" href="https://join.slack.com/t/json-schema/shared_invite/enQtNjc5NTk0MzkzODg5LTVlZGIxNmVhMGY2MWFlYTdiNDQ5NWFiZGUwOThhNmYxZDE0YzA5YjRiOTA5MGY4ZTZlZGZhZDFmYTY4NWM2N2Y">Join our Slack</a>
         </div>
       </nav>
     {%- endif -%}