Fix the bugs found in the pre-1.6 review of dev (#3112)

shared/data/docs.json

@@ -500,6 +500,10 @@
 							"title": "Social icons",
 							"url": "/ui/plugins/social-icons"
 						},
+						{
+							"title": "Sortable",
+							"url": "/ui/plugins/sortable"
+						},
 						{
 							"title": "Theme base colors",
 							"url": "/ui/plugins/theme-base-colors"