Unprototype Spaces

Summary: Ref T8449. Also, fix annoying inconsistency between "Spaces" and "spaces": "Spaces" is the application, the things it creates are just "spaces", similar to how "Maniphest" creates "tasks".

Test Plan: Mostly reading. Viewed `/applications/`.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: eadler, epriestley

Maniphest Tasks: T8449

Differential Revision: https://secure.phabricator.com/D13547

src/applications/spaces/application/PhabricatorSpacesApplication.php

@@ -31,11 +31,7 @@ final class PhabricatorSpacesApplication extends PhabricatorApplication {
   }
 
   public function canUninstall() {
-    return true;
-  }
-
-  public function isPrototype() {
-    return true;
+    return false;
   }
 
   public function getHelpDocumentationArticles(PhabricatorUser $viewer) {