Improve getting started project setup instructions

[owenpearson]

Fixes a couple of issues with the javascript project setup here:

• Fixes usage of undocumented tsc requirement, now this is explicitly installed with NPM and used from the installed package rather than expected to be installed globally.
• Fixes npm install before npm init -y, both of these commands create package.json if it doesn't already exist but generally you're supposed to init the project first.
• General minor technical wording improvements

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[vladvelici]

Should we recommend 22 LTS?

On that note, node 18 is now (as of last month) no longer maintained, so we should probably drop support: remove 18 and add 24 to tests.

[owenpearson]

ah good spot!

I think i'll change the wording here to "any LTS version of Node.js", wdyt?

I agree we should revisit support in the sdk too 👍

[vladvelici]

Sounds good 👍

[m-hulbert]

Thanks @owenpearson !