Reduce memory footprint with different start commands

[karlhorky]

From Tim Neutkens:

One quick optimization you can do for your app is removing pnpm start and using output: standalone or changing the command to ./node_modules/.bin/next start instead, that saves about 50MB in RSS

The output: 'standalone' docs say:

Next.js can automatically create a standalone folder that copies only the necessary files for a production deployment including select files in node_modules.

This will create a folder at .next/standalone which can then be deployed on its own without installing node_modules.

Additionally, a minimal server.js file is also output which can be used instead of next start. This minimal server does not copy the public or .next/static folders by default as these should ideally be handled by a CDN instead, although these folders can be copied to the standalone/public and standalone/.next/static folders manually, after which server.js file will serve these automatically.