Ease onboarding of new developers using devcontainers

[lesensei]

This tries to ease the setup of a new development environment for newcomers using devcontainers, while trying to touch the main code as little as possible.
Contained in the .devcontainer folder, it:

• adds a new .env file with presets that make sense for development
• adds the ports to forward in dev mode
• adds a "post create" script that installs dependencies, and collects static files
• adds a "post start" script that runs the db container, initializes it and then runs the backend and frontend in dev mode

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
adventurelog	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 8, 2025 9:07pm