fix: upgrade @docusaurus/core from 2.0.0-beta.21 to 2.2.0 (#538)

Snyk has created this PR to upgrade @docusaurus/core from 2.0.0-beta.21 to 2.2.0.

See this package in npm:
https://www.npmjs.com/package/@docusaurus/core

See this project in Snyk:
https://app.snyk.io/org/miotcm/project/b0113452-4446-4d25-a677-c7a819a513e5?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

website/package.json

@@ -8,7 +8,7 @@
   },
   "devDependencies": {},
   "dependencies": {
-    "@docusaurus/core": "2.0.0-beta.21",
+    "@docusaurus/core": "2.2.0",
     "@docusaurus/preset-classic": "2.0.0-beta.21",
     "clsx": "^1.1.1",
     "mdx-mermaid": "^1.2.3",