fix: remove duplicate code in markdown.py and document both markdown files in README

[Nakshathra-2808]

Fixes #375

Changes made

• Removed duplicate THEMES dict and convert_md_to_html() function from markdown.py — these were imported from md2html.py at the top but immediately redefined locally, making the import pointless
• markdown.py now correctly uses THEMES, convert_md_to_html, and markdown2 directly from md2html.py as intended
• Removed unused import (traceback) and dead variable (doc = None)
• Updated README Folder Descriptions to document both files separately:
  • md2html.py — standalone CLI tool and shared library
  • markdown.py — Flask blueprint that delegates to md2html.py

Testing

• Verified markdown.py imports correctly from md2html.py with no redefinition
• No changes to endpoint behavior — /convertMdToHtml works exactly as before

[vercel]

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[Durgeshwar-AI]

@Nakshathra-2808 Did you check whether the tool is still working or not?

[Nakshathra-2808]

Hi @Durgeshwar-AI — yes, I tested it end-to-end now. Backend started cleanly and I confirmed /convertMdToHtml works correctly via curl (heading and bold text rendered properly with the embedded theme CSS). I also ran the frontend (npm run dev), uploaded a test .md file through the UI, and the converted .html downloaded and rendered correctly in the browser.

Side note: while getting the server to start, I hit two unrelated pre-existing bugs blocking python main.py entirely — opened a separate PR for those here: #[new PR number]