feat: expand interview resources with 235+ community-curated sources across all topics

- Added 20-35+ sources per topic (Python, ML, NLP, GenAI, Deep Learning, Probability, Pandas, NumPy, SQL)
- Integrated Reddit community discussions for all 9 topics
- Added practice platforms (Prepfully, Glassdoor) and LinkedIn/Medium resources
- Maintained consistent structure: GitHub repos, Reddit discussions, practice platforms, educational resources
- Removed outdated Quick Reference Table
- Focused on community-accepted sources over SEO-optimized content

Author: singhsidhukuldeep