[gtk-web/new-website] Mark Discourse as an external link

[Emmanuele Bassi <ebassi src gnome org>]

commit ac896f7edda4b1060f191bfc254f8beaa65457f0
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Feb 18 19:13:37 2020 +0000

    Mark Discourse as an external link

 _data/navigation.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/_data/navigation.yml b/_data/navigation.yml
index 4defac1..90e68c4 100644
--- a/_data/navigation.yml
+++ b/_data/navigation.yml
@@ -74,6 +74,7 @@ menu_links:
     href: https://discourse.gnome.org
     header: false
     footer: true
+    external: true
     section: Community
   - name: Report a Bug
     href: https://gitlab.gnome.org/GNOME/gtk/issues/new