Docs: Update install instructions for Windows and Linux on the "Part 0" page (#18262)
Docs: Update install instructions for Windows and Linux on the "Part 0" page (#18262)

* improve setup instructions for windows and linux

* grammatical tweak

* add instructions per package manager on linux

* remove emoji, add npm info paragraph

* Add instructions similar to "Gatsby on Linux" page

* lint, fix typo, small improvements

* lint part 0 tutorial

* update image with correct Node.js versions

* Apply suggestions from code review

- Wording improvements
- Structure improvements

Co-Authored-By: LB <laurie@gatsbyjs.com>

* Wording fix

* add node and npm version check instructions

ilcm96/ilcm96.github.io