bump docusaurus to v3 (#386)

Author: itsgareth

website/package.json

@@ -12,10 +12,10 @@
     "clear": "docusaurus clear"
   },
   "dependencies": {
-    "@docusaurus/core": "2.4.3",
-    "@docusaurus/preset-classic": "2.4.3",
-    "react": "17.0.2",
-    "react-dom": "17.0.2"
+    "@docusaurus/core": "3.0.0-rc.0",
+    "@docusaurus/preset-classic": "3.0.0-rc.0",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
   },
   "browserslist": {
     "production": [