Use single source of info for dapp meta (build & display) (#4217)

* Add skipBuild flag

* Only use builtin.json to specify location

* Re-remove dapps/index.js

js/src/views/Dapps/builtin.json

@@ -71,7 +71,8 @@
     "description": "A Web 2.0 hosted pseudo-dapps browser.",
     "author": "Parity Team <admin@ethcore.io>",
     "version": "1.0.0",
-    "visible": true
+    "visible": true,
+    "skipBuild": true
   },
   {
     "id": "0xa635a9326814bded464190eddf0bdb90ce92d40ea2359cf553ea80e3c5a4076c",
@@ -81,6 +82,7 @@
     "version": "0.3",
     "author": "Gav Wood <gavin@ethcore.io>",
     "visible": true,
-    "secure": true
+    "secure": true,
+    "skipBuild": true
   }
 ]