Bump @docusaurus/core and @docusaurus/preset-classic from 2.0.0-beta.1 to 2.0.0-beta.3 (#994)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tom Brien <tom@byth.co.uk>

package.json

@@ -12,8 +12,8 @@
   },
   "dependencies": {
     "by-node-env": "^2.0.1",
-    "@docusaurus/preset-classic": "^2.0.0-beta.0",
-    "@docusaurus/core": "^2.0.0-beta.1",
+    "@docusaurus/preset-classic": "^2.0.0-beta.3",
+    "@docusaurus/core": "^2.0.0-beta.3",
     "@mdx-js/react": "^1.6.21",
     "clsx": "^1.1.1",
     "react": "^17.0.2",