[guadec-web/oscp-2019] Add subscribe link for attendees

[Tom Tryfonidis <tomtryf src gnome org>]

commit 12f412fc8e815b60795621a0e95b8ed2ac7ecfb9
Author: Tom Tryfonidis <tomtryf gmail com>
Date:   Tue Jan 29 19:39:06 2019 +0200

    Add subscribe link for attendees

 src/haml/index.haml | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/haml/index.haml b/src/haml/index.haml
index 3f72a29..837ece3 100644
--- a/src/haml/index.haml
+++ b/src/haml/index.haml
@@ -60,6 +60,12 @@
                 -#     %img{:src => "/images/group_photo-28434184137_f3102ac89e_b.jpg", :alt => "CC BY-SA 
GuilleFuertes" }
                 .h2.text-center GUADEC brings together Free Software enthusiasts and professionals from all 
over the world. Join us for six days of talks, demos, discussion, parties, games and more.
 
+        .row
+            .col.text-center
+                .h3 For GUADEC notifications before and during the conference, you can subscribe to the 
attendees list
+                %a{:href => "https://mail.gnome.org/mailman/listinfo/guadec-attendees-list";, :rel => 
"nofollow", :target => "_blank", :class => "btn btn-light"}
+                  Subscribe for news and updates
+
         -if SPONSORS
             .row.sponsors-home
                 .col