Update doc related to activityBar

docs/customization.md

@@ -46,6 +46,21 @@ In json files, you can just override the primary keys you need. You have to over
 
 - `home.json` to define homepage settings.
 
+  - `activityBar`: This is a menu showing all search types (hiking practices, outdoor practices, tourist content categories and tourist events categories).
+
+    - `shouldDisplay`: Boolean allowing this menu to be displayed or not. Its default value is `true`.
+    - `numberOfItemsBeforeTruncation` The number of items displayed on the screen. To see the others, click on the "Show more" button. Its default value is `8`.
+    - `links`: Allows you to customize the order and display of categories links. It's an array containing an object with 3 properties:
+      ```typescript
+      {
+        "type" : 'trek' | 'outdoorSite' | 'touristicContent' | 'touristicEvent' ;
+        "grouped" : boolean ; // If set to "true", all activities of the type are grouped under a single link.
+        "iconUrl" : string ; // Optional, url to replace default icon. Used only if "grouped" is set to "true",
+      }
+      ```
+
+    More explanations in this [comments](https://github.com/GeotrekCE/Geotrek-rando-v3/issues/560#issuecomment-1858166341) (in French).
+
   - `suggestions`: You can define blocks to display suggestions groups with treks ID, outdoor sites ID, services ID or events ID to highlight on homepage (see https://github.com/GeotrekCE/Geotrek-rando-v3/blob/main/frontend/customization/config/home.json).
     Each group has the following properties :