build(deps): bump @docusaurus/core in /website (#628)

Bumps [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus) from 2.0.0-alpha.70 to 2.0.0-alpha.71.
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/master/CHANGELOG-2.x.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v2.0.0-alpha.71/packages/docusaurus)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

website/package.json

@@ -11,7 +11,7 @@
         "serve": "docusaurus serve"
     },
     "dependencies": {
-        "@docusaurus/core": "2.0.0-alpha.70",
+        "@docusaurus/core": "2.0.0-alpha.71",
         "@docusaurus/preset-classic": "2.0.0-alpha.71",
         "@mdx-js/react": "^1.6.22",
         "clsx": "^1.1.1",