Add a dialog explaining what happened to wiki pages

Summary: Ayep.

Test Plan: {F233319}

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10845

src/applications/project/controller/PhabricatorProjectProfileController.php

@@ -261,6 +261,12 @@ final class PhabricatorProjectProfileController
       }
     }
 
+    $view->addAction(
+      id(new PhabricatorActionView())
+        ->setIcon('fa-book grey')
+        ->setName(pht('View Wiki'))
+        ->setWorkflow(true)
+        ->setHref('/project/wiki/'));
 
     return $view;
   }