fix: render inline markdown with generic syntax

[Timeless0911]

Summary

closes: #1536

Related Issue

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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[SoonIter]

😄 we should unify the sidebar, title, TOC, render logic

[Timeless0911]

If we use dangerouslySetInnerHTML, it forces users to write HTML entities < instead of \< which is more common in mdx writing. And the sidebar / markdown headings in cotent / TOC render logic should be unified.