Shrink Quepid Image by 1 GB

[epugh]

Is your feature request related to a problem? Please describe.
We only ever add to our Docker image layers, we never remove.

Describe the solution you'd like
adopt default Rails dockerfile pattern, and be able to get rid of node_modules from the resulting image.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[epugh]

https://github.com/rails/rails/blob/main/railties/lib/rails/generators/rails/app/templates/Dockerfile.tt for ideas