fix(nx): npm scripts documentation generation

[BuckyMaler]

Before, a single instance of yargs was accumulating options, so commands parsed later would have options from prior commands. That's because all yargs options are global by default. Now, a new instance of yargs is required before each command is parsed, so global options aren't accumulated.

I initially added global: false to all options in nx-commands.ts, but that didn't work because some yargs methods such as implies set globals. Since options being global doesn't seem to be an issue except with the docs gen, I chose to make the change there.

👉 lint-files, update, update:check, and update:skip now only document help and version because the docs are based on yargs options and those commands don't have specific yargs options. How would you like to handle these? We can leave them as is, filter them out, or add code to the docs gen to handle them? Removing them makes sense to me since lint-files and update:skip aren't npm scripts, and update and update:check are handled by Angular CLI.

fixes #1567 #1535

[vsavkin]

Thank you for your work on this!

update, update:check, and update:skip

I'd leave them as is

[vsavkin]

Rebased and merged it here: #1690

Thank you!

[github-actions]

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