Add basic redirect support

Signed-off-by: stianst <stianst@gmail.com>

pages/404.ftl

@@ -27,4 +27,6 @@
 
 </div>
 
+<script src="${links.getResource('js/redirect.js')}" type="text/javascript"></script>
+
 </@tmpl.page>

resources/js/redirect.js

@@ -0,0 +1,23 @@
+var page = window.location.pathname + window.location.hash;
+var openRedirects = new XMLHttpRequest();
+openRedirects.onreadystatechange = function() {
+    if (this.readyState == 4 && this.status == 200) {
+        var redirects = this.responseText.split(/\r?\n/);
+        for (var i = 0; i < redirects.length; i++) {
+            var redirect = redirects[i].split("=");
+            if (page.startsWith(redirect[0])) {
+                var checkRedirect = new XMLHttpRequest();
+                checkRedirect.onreadystatechange = function() {
+                    if (this.readyState == 4 && this.status == 200) {
+                        window.location = checkRedirect.responseURL;
+                    }
+                }
+                checkRedirect.open("GET", redirect[1], true);
+                checkRedirect.send();
+                break;
+            }
+        }
+    }
+  };
+openRedirects.open("GET", "/resources/redirects", true);
+openRedirects.send();

resources/redirects

@@ -0,0 +1,2 @@
+/docs/latest/security_apps=/guides#securing-apps
+/docs/latest/server_installation=/guides.html#server