Reorganized docs for docusaurus publish (#860)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] Documentation Update

web/src/pages/chat/chat-overview-modal/index.tsx

@@ -88,7 +88,7 @@ const ChatOverviewModal = ({
               <Button onClick={showApiKeyModal}>{t('apiKey')}</Button>
               <a
                 href={
-                  'https://github.com/infiniflow/ragflow/blob/main/docs/conversation_api.md'
+                  'https://github.com/infiniflow/ragflow/blob/main/docs/references/api.md'
                 }
                 target="_blank"
                 rel="noreferrer"