Refactor UX for well-known crate documentation route

Author: dirk

app/routes/crate/docs.js

@@ -11,18 +11,17 @@ export default Ember.Route.extend({
             crate = data.crate;
         }
 
-        var documentation = crate.get('documentation'),
-            self          = this;
+        var documentation = crate.get('documentation');
 
-        setTimeout(function() {
-            if (documentation) {
-                window.location = documentation;
-            } else {
-                // Redirect to the crate's main page if no documentation
-                // URL is found.
-                self.transitionTo('crate', crate);
-            }
-        }, 2500);
+        if (documentation) {
+            window.location = documentation;
+        } else {
+            // Redirect to the crate's main page and show a flash error if
+            // no documentation is found
+            var message = 'Crate does not supply a documentation URL';
+            this.controllerFor('application').set('nextFlashError', message);
+            this.replaceWith('crate', crate);
+        }
 
         this._super(controller, crate);
     },

app/templates/crate/docs.hbs

@@ -4,9 +4,5 @@
 </div>
 
 <p>
-    {{#if documentation}}
-        Redirecting you to <code>{{documentation}}</code>&#8230;
-    {{else}}
-        <strong>{{name}}</strong> is missing a documentation URL, returning to the crate main page&#8230;
-    {{/if}}
+    Redirecting you to <code>{{documentation}}</code>&#8230;
 </p>