Update 'Arc hive theme'

Arc-hive-theme.md

@@ -6,14 +6,15 @@ See https://git.hangar.org/arcHIVE-tech/Arc-hive-omeka-theme
 ## Create the landing site
 
 * Create a site called `Collections`
+  * `Pagination`: False
+  * `Show summaries`: True
+  * `Exclude current site`: True
 * Delete the `Welcome` page
 * Create a page called `Index`
   * Do not add this page to Navigation.
   * Remove the `Page title` block
-* Add the block `List of sites` 
-  * `Pagination`: False
-  * `Show summaries`: True
-  * `Exclude current site`: True
+  * Add a `Header image` block
+  * Add the block `List of sites` 
 * Navigation
   * Remove `Browse`
   * `Select a homepage`: Index