Update from upstream wg/pm/repositories.json

Author: w3cbot

wg/pm/repositories.json

@@ -303,6 +303,7 @@
    "login": "w3c"
   },
   "url": "https://github.com/w3c/publ-a11y-extended-desc",
+  "homepageUrl": "https://w3c.github.io/publ-a11y-extended-desc/",
   "description": "Documenting a11y extended descriptions, with an emphasis on digital publishing",
   "isArchived": false,
   "isPrivate": false,