fix: upgrade nextra-theme-docs from 2.0.0-alpha.59 to 2.2.18

Snyk has created this PR to upgrade nextra-theme-docs from 2.0.0-alpha.59 to 2.2.18.

See this package in npm:
https://www.npmjs.com/package/nextra-theme-docs

See this project in Snyk:
https://app.snyk.io/org/q1bluequantumblockchainlabs.onmicrosoft.com/project/01df33d9-97d5-4274-9f29-f2d812f68850?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

docs/package.json

@@ -17,7 +17,7 @@
     "next": "~12.2.5",
     "next-themes": "0.2.0",
     "nextra": "2.0.0-alpha.56",
-    "nextra-theme-docs": "2.0.0-alpha.59",
+    "nextra-theme-docs": "2.2.18",
     "react": "~18.2.0",
     "react-dom": "~18.2.0",
     "swr": "1.3.0"