Reorganize static assets and tidy configuration: update requirements.txt to list packages (with a note about using pip freeze), set Flask app to use explicit template_folder and static_folder, and normalize placeholder_readings keys from 'Status' to 'status'. Move existing JS/CSS into the static directory and add a small placeholder static/script.js. These changes prepare the project for proper static file serving and consistent data keys; no runtime logic was changed beyond placeholders and file layout.