chore(deps): bump @docusaurus/core in /docs (#220)

Bumps [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus) from 2.0.0-beta.0 to 2.0.0-beta.1.
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v2.0.0-beta.1/packages/docusaurus)

---
updated-dependencies:
- dependency-name: "@docusaurus/core"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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docs/package.json

@@ -12,7 +12,7 @@
     "clear": "docusaurus clear"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.0",
+    "@docusaurus/core": "^2.0.0-beta.2",
     "@docusaurus/preset-classic": "^2.0.0-beta.0",
     "@mdx-js/react": "^1.6.22",
     "clsx": "^1.1.1",