docs: reorganize documentation structure for better context efficiency

Reorganization changes:
1. Moved from root → docs/:
   - QUICKSTART.md
   - QUICK_TEST.md
   - WEBRTC_TESTING_GUIDE.md

2. Created docs/archive/ and moved archival files:
   - COMPLETED.md (completed tasks archive)
   - PHASE_1.5.md (historical phase documentation)
   - RESOURCES.md (learning resources)
   - SECURITY_AUDIT.md (security audit)
   - ADMIN_CLI.md (CLI documentation)

3. Updated all references in:
   - README.md
   - docs/CONTEXT.md
   - docs/TODO.md
   - docs/SESSION_CONTEXT.md
   - docs/DEPLOYMENT.md
   - docs/QUICK_TEST.md

Active docs/ now contains only essential files:
- SESSION_CONTEXT.md (primary for context restoration)
- TODO.md
- CONTEXT.md
- ARCHITECTURE.md
- DEPLOYMENT.md
- MONITORING.md
- QUICKSTART.md
- QUICK_TEST.md
- WEBRTC_TESTING_GUIDE.md

Benefits:
- Reduced token usage when reading docs/ for context
- Clear separation between active and archived documentation
- Better organization for future maintenance

docs/CONTEXT.md

@@ -168,8 +168,10 @@ const wyslijWiadomosc = (wiadomosc) => {
 **For full details:**
 - `docs/ARCHITECTURE.md` - Szczegóły techniczne, implementacja, WebRTC flow
 - `docs/TODO.md` - Lista zadań i roadmap
-- `docs/COMPLETED.md` - Archiwum ukończonych zadań
-- `docs/RESOURCES.md` - Linki do dokumentacji i zasobów edukacyjnych
+- `docs/DEPLOYMENT.md` - Production deployment guide
+- `docs/MONITORING.md` - Monitoring and operations
+- `docs/archive/COMPLETED.md` - Archiwum ukończonych zadań
+- `docs/archive/RESOURCES.md` - Linki do dokumentacji i zasobów edukacyjnych
 
 ---