Update hpc.html image links added

help/hpc.html

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                                     <p>
                                         To access the High-Performance Computing platform, one must have registered themselves with the organization that provides such services. In our case, users must have to register themselves with KIT. It is an organization that is providing services to access the high-performance cluster sponsored by Baden-Württemberg. Please visit the link: <a href="https://wiki.bwhpc.de/e/BwUniCluster_2.0_User_Access" target="_blank">how to register</a> to get the registration done.
                                     </p>
-                                    <img style="width:100%" src="/img/hpc/bwhpc.JPG" alt="hpc picture here">
+                                    <img style="width:100%" src="/img/hpc/bwhpc.jpg" alt="hpc picture here">
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