Getting started with the web

[Rumyra]

There are a few issues and discussions within those issues about some of the pages within the 'Getting started with the web' area: https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web

It probably needs a review and some parts re-written. This discussion provides a place to discuss any changes or rewrites.

Related issues:
mdn/content#18421
mdn/content#7048
mdn/content#18783