Remove CONFIGURATION.md and DEPLOYMENT.md files

Removed documentation files and updated references:
- Deleted CONFIGURATION.md and DEPLOYMENT.md
- Updated Dockerfile to remove CONFIGURATION.md copy
- Updated start.sh to remove CONFIGURATION.md copy
- Fixed license reference back to AGPL-3.0 (Docmost's actual license)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -26,7 +26,6 @@ RUN mkdir -p /tmp/data /app/data && \
 COPY start.sh /app/code/
 COPY nginx.conf /etc/nginx/sites-available/default
 COPY env.sample /app/code/env.sample
-COPY CONFIGURATION.md /app/code/CONFIGURATION.md
 
 # Override nginx global logs to prevent read-only filesystem errors
 RUN sed -i 's|error_log /var/log/nginx/error.log;|error_log /dev/stderr;|' /etc/nginx/nginx.conf && \