docs: add usage instructions to README

[tsevdos]

Hi all,

After a lot of trial and error, I managed to publish my NPM package to the NPM registry without using a token (see my action https://github.com/tsevdos/elUtils/blob/main/.github/workflows/publish.yml). I’m updating the documentation to make things easier for others. Feel free to leave any comments or additions.

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[Andarist]

this really should be the default, why do we want to call it out explicitly?

[Andarist]

we should start recommending the latest versions - actions/setup-node@v6 is already available

[tsevdos]

Hello there @Andarist ,

Should I proceed with your changes?

I have already tested the above steps and it's working on my OSS project (not AI generated content).