Updating links

README.md

+# GitLab Mattermost 
+
 GitLab Mattermost is a team communication service for sharing messages and
 files across PCs and phones, with archiving, instant search and integration 
 with GitLab Single-Sign-On. 
-*Screenshot: GitLab Mattermost team creation screen with SSO pre-configured from omnibus*
+*Screenshot: GitLab Mattermost desktop application on Windows with [GitLab theme](https://forum.mattermost.org/t/share-your-favorite-mattermost-theme-colors/1330/5?u=it33)
 ![alt text](https://gitlab.com/gitlab-org/gitlab-mattermost/raw/master/gitlab_theme.jpg)
+### Learn more
+
+- [GitLab Mattermost Administrator's Guide](http://doc.gitlab.com/omnibus/gitlab-mattermost/)
+- [GitLab Mattermost Discussion and Troubleshooting Forum](https://forum.mattermost.org/t/the-gitlab-mattermost-troubleshooting-forum/134)
+- [Mattermost Documentation](http://docs.mattermost.com/)
+
 ### GitLab Mattermost features include: 
 #### Messaging and File Sharing 
@@ -38,10 +46,8 @@ with GitLab Single-Sign-On.
 - [GitLab Mattermost SSO Documentation](http://docs.mattermost.com/deployment/sso-gitlab.html)
 - [GitLab Mattermost Troubleshooting Forum](http://forum.mattermost.org/c/general/gitlab)
-### Sharing feedback and filing issues: 
-- [GitLab Mattermost Troubleshooting Forum](http://forum.mattermost.org/c/general/gitlab)
+### Sharing feedback: 
+- [Report issues and get help from GitLab Mattermost Troubleshooting Forum](http://forum.mattermost.org/c/general/gitlab)
 - [Please report security issues via Mattermost Responsible Disclosure Policy](http://www.mattermost.org/responsible-disclosure-policy/)
-- [Please file GitLab Mattermost-specific bugs to the GitLab Mattermost issue tracker]( 
-https://gitlab.com/gitlab-org/gitlab-mattermost/issues).
-- [GitLab issues not related to GitLab Mattermost or GitLab omnibus](https://about.gitlab.com/getting-help/).
+- [Issues not related to GitLab Mattermost or GitLab omnibus](https://about.gitlab.com/getting-help/).