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

Bumps [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus) from 2.0.0-beta.3 to 2.0.0-beta.8.
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v2.0.0-beta.8/packages/docusaurus)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/package.json

@@ -15,7 +15,7 @@
     "typecheck": "tsc"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.3",
+    "@docusaurus/core": "^2.0.0-beta.8",
     "@docusaurus/preset-classic": "^2.0.0-beta.3",
     "@fortawesome/fontawesome-svg-core": "^1.2.32",
     "@fortawesome/free-solid-svg-icons": "^5.15.3",