docker.mdx: use `--omit=dev` for npm over deprecated `--production`

[corneliusroemer]

Description (required)

This fixes npm warnings that I get using the current suggested Dockerfile, see warnings:

[linux/arm64 build-deps 1/1] 
RUN npm install --production=false
npm WARN config production Use `--omit=dev` instead.
RUN npm install --production
npm WARN config production Use `--omit=dev` instead.

Related issues & labels (optional)

• Closes #
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[sarah11918]

Thank you everyone for discussing this so thoughtfully and thoroughly!

(And reminder, at this point it's only the submitted change that we're considering. If there's other text on the page someone feels should be changed, that's out of the scope of this proposed change and a separate PR can be made.)