message: docs: update `/config/app-package-json` redirect
  With this change we change the redirect for `/config/app-package-json` from `https://webpack.js.org/configuration/optimization/#optimizationsideeffects` to `https://angular.io/guide/strict-mode#non-local-side-effects-in-applications`
  The latter page has more details.
  PR Close
diff: // The below paths are referenced in users projects generated by the CLI
  {"type": 301, "source": "/config/tsconfig", "destination": "/guide/typescript-configuration"},
  {"type": 301, "source": "/config/solution-tsconfig", "destination": "https://devblogs.microsoft.com/typescript/announcing-typescript-3-9/#solution-style-tsconfig"},
  - {"type": 301, "source": "/config/app-package-json", "destination": "https://webpack.js.org/configuration/optimization/#optimizationsideeffects"}
  + {"type": 301, "source": "/config/app-package-json", "destination": "/guide/strict-mode#non-local-side-effects-in-applications"}
  ],
  "rewrites": [
  {
  