Add local CNCF logo (#591)

* Add local CNCF logo

Signed-off-by: lucperkins <lucperkins@gmail.com>

* Update footer icon

Signed-off-by: lucperkins <lucperkins@gmail.com>

website/layouts/partials/home/cncf.html

@@ -1,9 +1,10 @@
+{{ $logo := site.Params.logos.cncf | relURL }}
 <section class="section has-background-grey-lightest">
   <div class="container has-text-centered">
     <p class="title is-size-4 is-size-5-mobile has-text-weight-light">
       Virtual Kubelet is a <a href="https://cncf.io">Cloud Native Computing Foundation</a> sandbox project
     </p>
 
-    <img class="is-cncf-logo" src="https://raw.githubusercontent.com/cncf/artwork/master/cncf/horizontal/color/cncf-color.png" alt="Cloud Native Computing Foundation logo">
+    <img class="is-cncf-logo" src="{{ $logo }}" alt="Cloud Native Computing Foundation logo">
   </div>
 </section>