Improving the consistency in the case study logos

[shivansh-bhatnagar18]

Describe the change you'd like to see
In the case study section of the website, the logos of the companies are inconsistent in their sizes. This has a negative impact on the companies with different logo sizes. One can see this in the screenshots below and on https://knative.dev/docs/about/case-studies/pnc/

Additional context
It would be better if we create a better arrangement of the testimonials and the company's logos so that there is consistency in them.

[shivansh-bhatnagar18]

Also in pull request #5987, can we just reduce the size of the IBM logo if possible so that we ally ourselves with this issue?

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