USWDS - Docs: Add initial Key Benefits USWDS page.

[mejiaj]

Description

Preview link

Closes uswds/uswds#4150

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[KMullan944]

This looks great! Just a few edits, per below.

• In that intro section where we list the 6 benefits we expound upon in sections below, could you add jump-links to those sections? Or is that too distracting and was it omitted as a design decision?
• In "Cross-functional design system community" section, there's an external link to Github that has an icon with it. Pls delete.
• In the footer (above the Identifier?), "Become part of the community," there are 2 external links that need icon removed: Github and Twitter

And I think that's it! It reads well and is clear -- those are my only recommended edits. Thank you :)

[mejiaj]

@KMullan944 thank you for the feedback! The external links will be updated on a separate pull request (#1204).

Yes, I'll go ahead and update the list so it links below.

[thisisdano]

Remove margin

Suggested change

	<h2 id="how-to-make-the-case" class="margin-top-0">How to make the case for USWDS</h2>
	<h2 id="how-to-make-the-case" class="margin-x-0">How to make the case for USWDS</h2>

[mejiaj]

Should this be margin-y-0?