Update package.json - homepage 404

"homepage" entry has a link to a page that does not exist anymore.

This change follows up on the migrated webpage version so `npm info @inrupt/solid-client`  shows a valid link to solid-client-js documentation.

Author: hexagon6

package.json

@@ -31,7 +31,7 @@
     "linked data",
     "turtle"
   ],
-  "homepage": "https://docs.inrupt.com/client-libraries/solid-client-js/",
+  "homepage": "https://inrupt.github.io/solid-client-js/",
   "bugs": "https://github.com/inrupt/solid-client-js/issues",
   "main": "dist/index.js",
   "module": "dist/index.es.js",