Update pagx npm package repository URL and add homepage. (#3308)

Author: kevingpqi123

cli/npm/package.json

@@ -5,8 +5,9 @@
   "license": "Apache-2.0",
   "repository": {
     "type": "git",
-    "url": "https://github.com/libpag/libpag"
+    "url": "https://github.com/Tencent/libpag"
   },
+  "homepage": "https://github.com/Tencent/libpag#readme",
   "bin": {
     "pagx": "bin/pagx.js"
   },