README improvement #57
                
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Summary: Updated README to include Node/Yarn prerequisites, devcontainer info (Ubuntu 24.04.2 LTS), clearer install/start/build/deploy commands, and a note on using "$BROWSER" to open the site from the container.
Why: Makes onboarding and local development steps explicit for contributors and clarifies how to open the site from a devcontainer.
How to test:
Pull branch and open README in repo root.
Run yarn install then yarn start in the devcontainer.
Verify the server starts and that "$BROWSER" http://localhost:3000 opens the host browser.