Remove old google analytics code

This should not be used any more.

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>

Author: saschagrunert

images/build/debian-iptables/README.md

@@ -19,6 +19,3 @@ $ make all-push
 ```
 
 If you don't want to push the images, run `make build ARCH={target_arch}` or `make all-build` instead
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-[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/build/debian-iptables/README.md?pixel)]()