Clarify README with deployment and contribution workflow

[mmcky]

Summary

This PR improves the README with clearer documentation for:

1. GitHub Pages Deployment

• Added comprehensive deployment section explaining automatic deployment on push to main
• Documented manual deployment process via GitHub Actions
• Included custom domain setup for interactive.quantecon.org
• DNS configuration and CNAME file management

2. Content Management Workflow

• Clarified that contributors should edit files directly in this repository
• Explained the purpose of update_lectures.py (maintainer tool for syncing from upstream)
• Removed confusing cross-repository requirements
• Standard PR workflow: fork → branch → edit → test → PR

3. Contributing Guidelines

• Simplified to standard GitHub workflow
• Clear step-by-step instructions
• Automatic deployment after PR merge

4. Better Structure

• Reorganized sections for better flow
• Added Quick Start guide
• Added Troubleshooting section
• Technology stack overview
• Project structure diagram

Changes

• Enhanced deployment documentation
• Clarified content management process
• Improved contributing section
• Better overall organization and readability

Testing

• Verified all links work
• Confirmed instructions are clear and actionable

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[mmcky]

@kp992 should all updates happen via update_lectures.py? Does this make the necessary adjustments when syncing?

[kp992]

Thanks for opening this PR @mmcky. Hmm, almost all the major updates are handle in update_lectures.py but there are a few manual edits that I made this according to mystmd, so probably I can work on figuring out how to consolidate and write workflow for automatic updates.

[mmcky]

Thanks for opening this PR @mmcky. Hmm, almost all the major updates are handle in update_lectures.py but there are a few manual edits that I made this according to mystmd, so probably I can work on figuring out how to consolidate and write workflow for automatic updates.

Thanks @kp992 I am not sure this is worth the time to make this 100% -- just wanted to check the docs.