Revert "http2/h2demo: add HTTP/2 with Server Push"

Server Push is not more performant than regular HTTP/2 test
for this demo. I will produce a new demo page where Server Push
is clearly a better choice and consistently faster.

This reverts commit 3e967e1d28d2c9c06e749dc2bdc14b04df89e689.

Change-Id: Iace26e17714c0eca52785fc04d410df041e56415
Reviewed-on: https://go-review.googlesource.com/38608
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed