Apply new design to "Why serverless containers" section

[rohitsrma]

Apply new design to "Why serverless containers" section and resolve layout inconsistencies on mobile devices.

Before

After

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: rohitsrma / name: Rohit Sharma (79d4509, fc7588b, fed2433)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

Welcome @rohitsrma! It looks like this is your first PR to knative/docs 🎉

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[pierDipi]

Thanks @rohitsrma

/cc @mmejia02 @zainabhusain227

[pierDipi]

/ok-to-test

[Cali0707]

ping @mmejia02 @zainabhusain227 - does this look good to you from a design perspective?

[Cali0707]

/close
Superceded by #6041

[knative-prow]

@Cali0707: Closed this PR.

In response to this:

/close
Superceded by #6041

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