MDN React tutorials #1: Getting started (mdn#30177)

* chore: replace create-react-app with vite

* chore: .js --> .jsx

* chore: add dev script section

* chore: update App component walkthrough

* fix: use correct h1 link

* feat: rewrite more

* chore: apply suggestions from review

Co-authored-by: Chris Mills <chrisdavidmills@gmail.com>

* chore: fix npm script syntax

* chore: rewrite node install instructions

* chore: delete extraneous section

* chore: delete image from replacement code

* chore: add syntax explainer

* chore: clean up final section

* chore: rewrite jsx section

* chore: nitpick notes

* chore: delete React 17 note

* chore(nit): hard drive -> machine

* chore: apply suggestions from code review

Co-authored-by: Chris Mills <chrisdavidmills@gmail.com>

* remove superfluous quote

* chore: replace create-react-app image with vite

* chore: index.jsx --> main.jsx

* chore: clean up prop-comment section

* chore: delete note on multi-word attributes

* chore: use code syntax in heading

* chore: change npm script note

* chore: update note again

* chore: fix image alt

* chore: apply suggestions from code review

Co-authored-by: Chris Mills <chrisdavidmills@gmail.com>

* chore: replace rollup mention with generic bundler reference

* chore: document assets directory

* chore: document lockfile

* chore: disambiguate app function and component

* chore: add some

* Small App() related tweaks

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Co-authored-by: Chris Mills <chrisdavidmills@gmail.com>