Clean up case study images.

content/en/case-studies/jd-com/index.html

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-<div class="banner1" style="background-image: url('/images/CaseStudy_jdcom_banner1.jpg')">
+<div class="banner1" style="background-image: url('/images/case-studies/jdcom/banner1.jpg')">
   <h1> CASE STUDY:<img src="/images/jdcom_logo.png" class="header_logo" style="width:17%;margin-bottom:-1%"><br> <div class="subhead" style="margin-top:1%">JD.com: How JD.com Pioneered Kubernetes for E-Commerce at Hyperscale
 
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-<div class="banner3" style="background-image: url('/images/CaseStudy_jdcom_banner3.jpg')">
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     "We customized Kubernetes and built a modern system on top of it. This entire ecosystem of Kubernetes plus our own optimizations have helped us save costs and time."<br style="height:25px"><span style="font-size:14px;letter-spacing:2px;text-transform:uppercase;margin-top:5% !important;"><br>- HAIFENG LIU, CHIEF ARCHITECT, JD.com</span>
 
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-<div class="banner4" style="background-image: url('/images/CaseStudy_jdcom_banner4.jpg');width:100%">
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   "My advice is first you need to combine this technology with your own businesses, and the second is you need clear goals. You cannot just use the technology because others are using it. You need to consider your own objectives." <br style="height:25px"><span style="font-size:14px;letter-spacing:2px;text-transform:uppercase;margin-top:5% !important;"><br>- HAIFENG LIU, CHIEF ARCHITECT, JD.com</span>
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