Better 404 (and 403) pages

Fixes #1819

static/js/app.js

@@ -207,8 +207,9 @@ quayApp.config(['$routeProvider', '$locationProvider', 'pages', function($routeP
     // Public Repo Experiments
     .route('/__exp/publicRepo', 'public-repo-exp')
 
-    // Default: Redirect to the landing page
-    .otherwise({redirectTo: '/'});
+    // 404/403
+    .route('/:catchall', 'error-view')
+    .route('/:catch/:all', 'error-view');
 }]);
 
 // Configure compile provider to add additional URL prefixes to the sanitization list. We use