Record Flask-Smorest section and improve code slightly

[jslvtr]

• Slightly improvements to the project code that is covered in this section
• Split lecture 2 (improvements to first REST API) into 3:
  • Improvements to first REST API, covering adding some error handling
  • New endpoints for the API, covering adding updating and deleting items, and deleting stores
  • Reload the API running in a container, covering how to use Docker volumes so we don't have to rebuild the Docker image each time we make code changes in development
• Use /item and /store instead of /items and /stores, to match what more specific endpoints use (e.g. /item/<id>).

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