[extensions-web] Fixed `new issue` link - we migrated to Gitlab a while ago.

[Yuri Konotopov <ykonotopov src gnome org>]

commit cc9cfbc09cd6534f33b6215f68a709841f409a63
Author: Yuri Konotopov <ykonotopov gnome org>
Date:   Fri Mar 22 21:10:02 2019 +0400

    Fixed `new issue` link - we migrated to Gitlab a while ago.
    
    Bug: https://gitlab.gnome.org/Infrastructure/Infrastructure/issues/118

 sweettooth/templates/500.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/sweettooth/templates/500.html b/sweettooth/templates/500.html
index 49f5d67..68b9d35 100644
--- a/sweettooth/templates/500.html
+++ b/sweettooth/templates/500.html
@@ -2,5 +2,5 @@
 {% block title %}Uh oh... - {{ block.super }}{% endblock %}
 {% block body %}
 <h3>500 - Internal Server Error</h3>
-<p>The server had an error when you wanted to access this page. Please <a 
href="https://bugzilla.gnome.org/enter_bug.cgi?product=website&component=extensions.gnome.org";>let us know 
what you did</a> so we can fix it!</p>
+<p>The server had an error when you wanted to access this page. Please <a 
href="https://gitlab.gnome.org/Infrastructure/extensions-web/issues/new";>let us know what you did</a> so we 
can fix it!</p>
 {% endblock %}