feat(grid): remove viewportIndex and only rely on viewportId (#3591)

Co-authored-by: Bill Wallace <wayfarer3130@gmail.com>

package.json

@@ -120,7 +120,7 @@
     "postcss-import": "^14.0.2",
     "postcss-loader": "^6.1.1",
     "postcss-preset-env": "^7.4.3",
-    "prettier": "^1.18.2",
+    "prettier": "^3.0.3",
     "react-hot-loader": "^4.13.0",
     "semver": "^7.5.1",
     "serve": "^14.2.0",