docs: remove QUICKSTART.md (redundant with DEMO.md)

[timduly4]

Summary

Removes QUICKSTART.md as it's 60% redundant with DEMO.md and causes user confusion about which guide to follow first.

Why Delete QUICKSTART.md?

Significant Overlap (60%)

Both guides cover:

• Docker setup (docker compose up)
• Health check verification
• Database migrations (alembic upgrade head)
• Troubleshooting common issues
• Service verification steps

DEMO.md is Superior

DEMO.md advantages:

• ✅ Shows you how to USE the system (search, gap detection)
• ✅ Includes complete setup walkthrough (Parts 1-2)
• ✅ Provides working API examples with real queries
• ✅ Explains how to interpret results
• ✅ Interactive and hands-on

QUICKSTART.md drawbacks:

• ❌ Stops after setup (no usage examples)
• ❌ References outdated milestone structure
• ❌ User confusion: "Which do I follow?"
• ❌ Unique content better suited elsewhere

What About Unique Content?

QUICKSTART.md's unique sections can be relocated:

Content	Better Location
Local dev without Docker	Main README or future DEVELOPMENT.md
Command reference (docker, psql, redis)	Main README (already has most)
Database schema docs	API.md or DATABASE.md
Development workflow	Future DEVELOPMENT.md if needed

Changes Made

Deleted File:

• docs/QUICKSTART.md (390 lines)

Updated References in docs/README.md:

1. Removed from "API & Usage" section
2. Removed from file tree diagram
3. Changed "Get started quickly" section:
   • Before: → See QUICKSTART.md
   • After: → See DEMO.md - Interactive 15-minute walkthrough (includes setup)

New User Flow

Before (confusing):

New User → "Which do I read?"
  ├─ QUICKSTART.md (just setup)
  └─ DEMO.md (setup + usage)

After (clear):

New User → DEMO.md (complete walkthrough)
  └─ Part 1-2: Setup (2 min)
  └─ Part 3-7: Usage & Features (13 min)

Statistics

• Deleted: 390 lines of documentation
• Updated: 3 references in docs/README.md
• Net: Simpler, clearer documentation structure
• Docs count: 11 files (down from 12)

Testing

• ✅ Verified no other files reference QUICKSTART.md
• ✅ Confirmed DEMO.md includes full setup instructions
• ✅ Checked all links in docs/README.md work
• ✅ DEMO.md is complete standalone guide

Impact

• Users: Clearer path for getting started (one guide, not two)
• Maintainers: Less documentation to keep in sync
• Documentation: Simpler, more focused structure

Future Consideration

If we need detailed local development docs (UV setup, hot reload, testing workflow), we can create a focused DEVELOPMENT.md guide. For now, DEMO.md + main README are sufficient.