Use {type}/{shortname} per https://w3c.github.io/w3c.json.html

Author: plehegar

w3c.json

@@ -1,8 +1,8 @@
 {
-  "group": 32061,
+  "group": "wg/css",
   "contacts": [
     "svgeesus"
   ],
   "repo-type": "rec-track",
   "policy": "open"
-}
+}