Set global and project-specific forum URLs

_config.yml

@@ -9,6 +9,7 @@ redcarpet:
 ### Spring website specific
 main_site_url: http://springframework.io
 projects_site_url: http://projects.springframework.io
+forum_url: http://forum.springframework.io
 
 ### For testing only (comment this out in a real project)
 sample: true
@@ -28,5 +29,5 @@ project: spring-framework
 # Project github URL
 github: https://github.com/SpringSource/spring-framework
 
-# A forum link for the navbar
-forum: http://forum.springsource.org
+# A forum link specific to this project
+forum: http://forum.springframework.io/forum/spring-projects/container

_layouts/default.html

@@ -54,7 +54,7 @@
             <a href="{{site.main_site_url}}/blog">Blog</a>
           </li>
           <li class="navbar-link">
-            <a href="{{site.forum}}">Forum</a>
+            <a href="{{site.forum_url}}">Forum</a>
           </li>
           <li class="navbar-link nav-search">
             <i class="icon-search navbar-search--icon js-search-input-open"></i>