Switching from config file to parsing homelink from url

web/react/components/login.jsx

@@ -74,7 +74,7 @@ var FindTeamDomain = React.createClass({
                     <br/>
                     <br/>
                     <div>
-                        <span>{"Want to create your own " + strings.Team + "?"} <a href={config.HomeLink} className="signup-team-login">Sign up now</a></span>
+                        <span>{"Want to create your own " + strings.Team + "?"} <a href={utils.getHomeLink()} className="signup-team-login">Sign up now</a></span>
                     </div>
                 </form>
             </div>
@@ -188,7 +188,7 @@ module.exports = React.createClass({
                         <a href="/reset_password">I forgot my password</a>
                     </div>
                     <div className="external-link">
-                        <span>{"Want to create your own " + strings.Team + "?"} <a href={config.HomeLink} className="signup-team-login">Sign up now</a></span>
+                        <span>{"Want to create your own " + strings.Team + "?"} <a href={utils.getHomeLink()} className="signup-team-login">Sign up now</a></span>
                     </div>
                 </form>
             </div>

web/react/utils/utils.jsx

@@ -730,3 +730,15 @@ Image.prototype.load = function(url, progressCallback) {
 };
 
 Image.prototype.completedPercentage = 0;
+
+module.exports.getHomeLink = function() {
+	if (config.HomeLink != "") {
+		return config.HomeLink;
+	}
+	var parts = window.location.host.split(".");
+	if (parts.length <= 1) {
+		return window.location.host;
+	}
+	parts[0] = "www";
+	return parts.join(".");
+}