[Gobal] added flake8 and did format

AGENTS.md

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+# AGENTS.md
+
+## Core Workflow
+
+- **Setup**: `make prep` (creates `.venv` and installs `requirements.txt`)
+- **Build**: `make build` (runs `atom_gen.py`, `prep.py`, and `build_pages.py`)
+- **Events**: Update `dogadjaji.csv` then run `make events` (updates pages and generates images via `image_poster.py`)
+- **Development**: `make dev` (starts Nginx using `nginx.dev.conf`) and `make stop` to terminate.
+
+## Technical Details
+
+- **Environment**: Uses a local virtual environment in `.venv`. Always use `./.venv/bin/python` or ensure the venv is activated.
+- **Output**: The generated website is stored in the `site/` directory.
+- **Data**: Events are driven by `dogadjaji.csv`.
+- **Web Server**: Uses Nginx for the development server.