Bugfixes (#74)

* Fix demo post date format
* Fix test data
* Fix sorting
* Fix load more
* Fix markdown preview not updating
* Load relation options if value provided
* Update entry with default date
* Better change detection
* Fix sticky headers on tablet view (docs site)

core/dev-test/config.yml

@@ -2,6 +2,7 @@ backend:
   name: test-repo
 site_url: 'https://example.com'
 media_folder: assets/uploads
+locale: en
 collections:
   - name: posts
     label: Posts
@@ -48,7 +49,7 @@ collections:
         widget: datetime
         date_format: yyyy-MM-dd
         time_format: 'HH:mm'
-        format: 'yyyy-MM-dd HH:mm'
+        format: "yyyy-MM-dd'T'HH:mm:ss.SSSXXX"
       - label: Cover Image
         name: image
         widget: image