Clean up case study images.

content/en/case-studies/openAI/index.html

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   <h1> CASE STUDY:<img src="/images/openAI_logo.png" style="margin-bottom:-1%" class="header_logo"><br> <div class="subhead">Launching and Scaling Up Experiments, Made Simple
 
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     OpenAI’s experiments take advantage of Kubernetes’ benefits, including portability. "Because Kubernetes provides a consistent API, we can move our research experiments very easily between clusters..."
 
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 "One of our researchers who is working on a new distributed training system has been able to get his experiment running in two or three days," says Berner. "In a week or two he scaled it out to hundreds of GPUs. Previously, that would have easily been a couple of months of work."
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