docs(rc4-to-rc5): change cleanup

closes #2516

Author: Foxandxss

public/docs/dart/latest/cookbook/_data.json

@@ -53,12 +53,6 @@
     "hide": true
   },
 
-  "rc4-to-rc5": {
-    "title": "RC4 to RC5 Migration",
-    "intro": "Migrate your RC4 app to RC5 in minutes.",
-    "hide": true
-  },
-
   "set-document-title": {
     "title": "Set the Document Title",
     "intro": "Setting the document or window title using the Title service."

public/docs/dart/latest/cookbook/rc4-to-rc5.jade

@@ -48,12 +48,6 @@
     "hide": true
   },
 
-  "rc4-to-rc5": {
-    "title": "RC4 to RC5 Migration",
-    "intro": "Migrate your RC4 app to RC5 in minutes.",
-    "hide": true
-  },
-
   "set-document-title": {
     "title": "Set the Document Title",
     "intro": "Setting the document or window title using the Title service."

public/docs/js/latest/cookbook/_data.json

@@ -51,11 +51,6 @@
     "intro": "Translate the app's template text into multiple languages"
   },
 
-  "rc4-to-rc5": {
-    "title": "RC4 to RC5 Migration",
-    "intro": "Migrate your RC4 app to RC5 in minutes."
-  },
-
   "set-document-title": {
     "title": "Set the Document Title",
     "intro": "Setting the document or window title using the Title service."