switch to cloudflare turnstile

package.json

@@ -21,7 +21,6 @@
   },
   "dependencies": {
     "@giscus/react": "^3.0.0",
-    "@hcaptcha/react-hcaptcha": "^1.10.1",
     "@libsql/client": "^0.6.2",
     "@novnc/novnc": "1.4.0",
     "@octokit/graphql": "^8.1.1",
@@ -59,6 +58,7 @@
     "react-is": "18.3.1",
     "react-player": "^2.16.0",
     "react-textarea-autosize": "^8.5.3",
+    "react-turnstile": "^1.1.3",
     "react-tweet": "^3.2.1",
     "rehype-prism-plus": "^2.0.0",
     "rehype-sanitize": "^6.0.0",