fix: docs/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NEXT-9508709
- https://snyk.io/vuln/SNYK-JS-NEXT-8520073
- https://snyk.io/vuln/SNYK-JS-NEXT-12299318
- https://snyk.io/vuln/SNYK-JS-CROSSSPAWN-8303230
- https://snyk.io/vuln/SNYK-JS-BABELRUNTIME-10044504
- https://snyk.io/vuln/SNYK-JS-NEXT-8186172
- https://snyk.io/vuln/SNYK-JS-NEXT-6032387
- https://snyk.io/vuln/SNYK-JS-NEXT-10176058
- https://snyk.io/vuln/SNYK-JS-JSYAML-13961110
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692
- https://snyk.io/vuln/SNYK-JS-NEXT-12301496
- https://snyk.io/vuln/SNYK-JS-NANOID-8492085
- https://snyk.io/vuln/SNYK-JS-NEXT-12265451

Author: snyk-bot

docs/package.json

@@ -16,8 +16,8 @@
     "@heroicons/react": "~1.0.6",
     "next": "~12.2.5",
     "next-themes": "0.2.0",
-    "nextra": "2.0.0-alpha.56",
-    "nextra-theme-docs": "2.2.18",
+    "nextra": "2.0.0",
+    "nextra-theme-docs": "2.0.0",
     "react": "~18.2.0",
     "react-dom": "~18.2.0",
     "swr": "1.3.0"