Apply New Designs to Case Studies Section

[rohitsrma]

In this PR I've implemented the new designs for the case studies section, as provided in the Figma design shared by @mmejia02

Before

After

[knative-prow]

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[shivamgupta2020]

@rohitsrma, I think you should fix the following:-

1. The font style should be changed to Roboto.
2. In mobile mode, the margin should be increased between two blocks.
3. the "case study" font and style do not match the design in mobile mode.

[knative-prow-robot]

PR needs rebase.

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[Cali0707]

/close this was superceded by #6032

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