fix(@h6s/website): revert bump react18

[SoYoung210]

• docusaurus does not support react18 yet
  • Migrate to React 18 facebook/docusaurus#7264
• update charkra-ui@v2
  • v1 does not support react18

@JaeYeopHan i missed #223 branch deploy of "h6s.dev" was canceled. sorry 🙏

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[SoYoung210]

check example/react result..

next-dev.js?95dc:20 Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17

i'll reopen pr after resolve above issue → Clear!