Make the sidebar foldable.

Signed-off-by: Denis Kasak <dkasak@termina.org.uk>

config.toml

@@ -66,6 +66,8 @@ rendered_data_collapsed = false
 sidebar_search_disable = true
 # Only show the current page's ancestors, siblings and direct descendants in the sidebar menu
 sidebar_menu_compact = true
+# Make sidebar menu foldable for easier navigation
+sidebar_menu_foldable = true
 
 [params.links]
 # End user relevant links. These will show up on left side of footer and in the community page if you have one.