fix registry item schema (#7486)

Author: thibaultleouay

apps/www/public/schema/registry-item.json

@@ -78,7 +78,8 @@
               "registry:hook",
               "registry:theme",
               "registry:page",
-              "registry:file"
+              "registry:file",
+              "registry:style"
             ],
             "description": "The type of the file. This is used to determine the type of the file when resolved for a project."
           },