fix(docker): copy content/ directory into image

content/articles/ holds the cornerstone .md source files which
_sync_static_articles() reads on every /admin/articles load.
Without this COPY they were absent from the container.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -26,6 +26,7 @@ RUN mkdir -p /app/data && chown -R appuser:appuser /app
 COPY --from=build --chown=appuser:appuser /app .
 COPY --from=css-build /app/web/src/padelnomics/static/css/output.css ./web/src/padelnomics/static/css/output.css
 COPY --chown=appuser:appuser infra/supervisor/workflows.toml ./infra/supervisor/workflows.toml
+COPY --chown=appuser:appuser content/ ./content/
 USER appuser
 ENV PYTHONUNBUFFERED=1
 ENV DATABASE_PATH=/app/data/app.db