Adding page changelog

Modules/Page/changelog.yml

 url: https://github.com/AsgardCms/Platform
 versions:
+    "3.2.0@unreleased":
+        changed:
+            - Adding the page status field
+            - Sending the page id from the route parameters to the single media component (makes loading single media faster)
     "3.1.0":
         added:
             - New UI interaction on the page index to select pages and mark one or mutiple as on/offline