Update 'Arc hive theme'

Arc-hive-theme.md

@@ -3,6 +3,19 @@
 ## Installation
 See https://git.hangar.org/arcHIVE-tech/Arc-hive-omeka-theme
 
+## Create the landing site
+
+* Create a site called `Collections`
+* Delete the `Welcome` page
+* Create a page called `index`. Do not add this page to Navigation.
+* Add the block `List of sites` 
+  * `Pagination`: False
+  * `Show summaries`: True
+  * `Exclude current site`: True
+  * 
+
+
+
 ## Create a new site
 
 * Navigation -> Remove the `Browse` item