Fix link to Discourse.org homepage in noscript section (mmistakes#699)

Author: t-richards

_includes/comments-providers/discourse.html

@@ -9,5 +9,5 @@
      (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(d);
    })();
 </script>
-<noscript>Please enable JavaScript to view the comments powered by [Discourse](http://forum.beta-europe.org/c/beta/website).</a></noscript>
-{% endif %}
+<noscript>Please enable JavaScript to view the comments powered by <a href="https://www.discourse.org/">Discourse.</a></noscript>
+{% endif %}