Multiple upgrades and a new feature: docker compose.

• Add warning about missing data.db in repo when doing first deploy via #136
• Add metadata for publishing course on Teclado
• Use Cloudinary for image hosting
• Fix text rendering in top banner via #139
• Update Python base image to bookworm via #142
• Use __name__ in blueprint definitions via #143
• Use emails/action.html instead of emails/registration.html via #144
• Remove creating db when running app; instead doing it via db migrations, via #145
• Add missing ItemSchema import on section 6 via #146
• Remove unnecessary compare_type in Alembic config file via #147
• Add information on running app and database with Docker Compose via #147
• Fix JS dependencies for Docusaurus upgrade via #156
• Add optional store_id to ItemUpdateSchema via #157
• Add missing os import in Flask-SQLAlchemy configuration lecture (S06 L04) via #158
• Remove unnecessary version key in docker-compose.yml files via #159
• Add info on running arbitrary commands in a Docker Compose container via #160