Update 'Omeka core'

Omeka-core.md

@@ -1,6 +1,6 @@
 Things to do after upgrading the Omeka core.
 
-## Disable modules
+## Disable blocks
 
 https://git.hangar.org/arcHIVE-tech/Docs/wiki/Disabling-modules
 
@@ -63,3 +63,23 @@ Add this class to the `class Html extends AbstractBlockLayout`
         $block->setData($data);
     }
 ```
+
+## Disable YouTube module
+
+We have our own module 'Oembed a la Arc-hive' that handles oembedded objects resizing
+
+Edit `/application/config/module.config.php` and comment out these two lines
+
+```
+    ......
+    'media_ingesters' => [
+        'factories' => [
+            //'youtube' => Service\Media\Ingester\YoutubeFactory::class,
+        ],
+    ],
+    'media_renderers' => [
+        'invokables' => [
+            //'youtube' => Media\Renderer\Youtube::class,
+        ],
+        ........
+```