Remove hackathon and Adobe references, reformat as standalone project

[Copilot]

This PR transforms the repository from a hackathon submission into a standalone open-source project by removing all references to Adobe, hackathons, rounds, and competition context while preserving the technical functionality and quality of the document intelligence system.

Key Changes Made

README.md Updates:

• Changed title from "Adobe India Hackathon: Document Intelligence (Round 1B)" to "Document Intelligence System"
• Replaced "Team Sentinels" with "Contributors" section
• Removed all mentions of hackathons, competitions, and round references
• Updated file naming conventions from hackathon-specific names (challenge1b_input.json, challenge1b_output.json) to generic names (input.json, output.json)
• Revised copyright section to remove Adobe references while preserving contributor rights
• Updated Docker instructions and directory structure examples to reflect new naming

main.py Updates:

• Updated module docstring to remove round-specific references
• Changed file I/O to use generic filenames instead of challenge-specific ones
• Updated comments to remove "Round-1A" and "Round-1B" references
• Maintained all technical functionality and processing logic

Technical Integrity Preserved

The document intelligence system remains fully functional with all its sophisticated features:

• Hybrid approach combining structural analysis, semantic understanding, and keyword relevance
• Parallel PDF processing with multi-core optimization
• Granite-107M multilingual embeddings for semantic analysis
• BM25 keyword matching with configurable weighting
• Granular subsection refinement with sliding window analysis
• Docker containerization for reproducible deployment

The changes are purely cosmetic and organizational - no algorithms, dependencies, or core functionality has been modified.

Fixes #3.

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