Clean up docs

[FanwangM]

Clean up docs

[Copilot]

🟡 Changes recommended

The new dependency line has a package-name mismatch (densepart vs denspart) and the VCS dependency is unpinned, making installs fragile/non-reproducible.

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Pull request overview

Updates documentation formatting in README.md, and introduces a new dependency in requirements.txt to support denspart-based functionality already present in the codebase.

Changes:

• Reformat README.md headings to standard Markdown (#, ##).
• Add a VCS-based dependency for denspart to requirements.txt.

File summaries

File	Description
requirements.txt	Adds denspart as a dependency via a GitHub VCS URL.
README.md	Converts the title and section headers to Markdown heading syntax.

Review details

• Files reviewed: 1/2 changed files
• Comments generated: 0
• Review effort level: Lite

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