Update Windows commands

[sabi0]

What?

The k6 executable from the latest .msi installer says it does not know the init parameter:

C:\>k6 init ERRO[0000] unknown command "init" for "k6.exe" 

I suppose new should be used instead, like on Linux.

Also I changed Windows commands to run k6 executable directly instead of via Docker.

Checklist

• I have used a meaningful title for the PR.
• I have described the changes I've made in the "What?" section above.
• I have performed a self-review of my changes.
• I have run the npm start command locally and verified that the changes look good.

• I have made my changes in the docs/sources/next folder of the documentation.
• I have reflected my changes in the docs/sources/v{most_recent_release} folder of the documentation.
• I have reflected my changes in the relevant folders of the two previous k6 versions of the documentation (if still applicable to previous versions).

Related PR(s)/Issue(s)

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[PontusMagnusson]

I encountered the same issue, but I cannot use k6 new if I've installed via winget. It would probably require configuring the PATH environment variable, but that is not reflected in the documentation.

Running docker run --rm -i -v ${PWD}:/app -w /app grafana/k6 new works though.

[heitortsergent]

@sabi0 thanks for the opening the PR, and sorry about the delay!

Based on @PontusMagnusson feedback, it seems that keeping the Docker commands for now would help most users, I left some comments to revert that and just changing the init command to new.

[heitortsergent]

Suggested change

	PS C:\> k6 new
	PS C:\> docker run --rm -i -v ${PWD}:/app -w /app grafana/k6 new

[heitortsergent]

Suggested change

	PS C:\> k6 run script.js
	PS C:\> cat script.js | docker run --rm -i grafana/k6 run -

[heitortsergent]

Suggested change

	PS C:\> k6 run --vus 10 --duration 30s script.js
	PS C:\> cat script.js | docker run --rm -i grafana/k6 run --vus 10 --duration 30s -

[heitortsergent]

Suggested change

	PS C:\> k6 run script.js
	PS C:\> cat script.js | docker run --rm -i grafana/k6 run -