Clean up case study images.

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

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-<div class="banner1" style="background-image: url('/images/CaseStudy_spotify_banner1.jpg')">
+<div class="banner1" style="background-image: url('/images/case-studies/spotify/banner1.jpg')">
   <h1> CASE STUDY: Spotify<br> <div class="subhead" style="margin-top:1%">Spotify: An Early Adopter of Containers, Spotify Is Migrating from Homegrown Orchestration to Kubernetes
 
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-<div class="banner3" style="background-image: url('/images/CaseStudy_spotify_banner3.jpg')">
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     "The community has been extremely helpful in getting us to work through all the technology much faster and much easier. And it’s helped us validate all the things we’re doing." <br style="height:25px"><span style="font-size:14px;letter-spacing:2px;text-transform:uppercase;margin-top:5% !important;"><br>- Dave Zolotusky, Software Engineer, Infrastructure and Operations, Spotify</span>
 
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-<div class="banner4" style="background-image: url('/images/CaseStudy_spotify_banner4.jpg')">
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   "We were able to use a lot of the Kubernetes APIs and extensibility features to support and interface with our legacy infrastructure, so the integration was straightforward and easy."<br style="height:25px"><span style="font-size:14px;letter-spacing:2px;text-transform:uppercase;margin-top:5% !important;"><br>- James Wen, Site Reliability Engineer, Spotify</span>
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