Upgrade Docusaurus to v2

Author: filiptammergard

website/package.json

@@ -7,8 +7,8 @@
     "deploy": "yarn add-pages-on-site && docusaurus deploy"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-alpha.61",
-    "@docusaurus/preset-classic": "^2.0.0-alpha.61",
+    "@docusaurus/core": "^2.1.0",
+    "@docusaurus/preset-classic": "^2.1.0",
     "classnames": "^2.2.6",
     "react": "^16.13.1",
     "react-dom": "^16.13.1"