Showcase redesign

[1Iv4N]

[b/141305122] Showcase redesign.

What's included?

• New showcase page.
• Cleanup styles and assets from the previous version.

[googlebot]

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[1Iv4N]

@googlebot I signed it!

[sfshaza2]

@1Iv4N, can you provide me with the URL for a staged version of the site? If you'd rather not put it in this PR, just email or IM it to me. Thx

[1Iv4N]

Hi @sfshaza2 I sent an email with the information. Thanks!

[sfshaza2]

@maguinis, can you confirm that the company has signed an NDA?

[sfshaza2]

@maguinis has confirmed that all involved have signed an NDA

[googlebot]

A Googler has manually verified that the CLAs look good.

(Googler, please make sure the reason for overriding the CLA status is clearly documented in these comments.)

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[sfshaza2]

LGTM!