[release-branch.go1.16] README: pull gopher image from website
Fixes breakage accidentally introduced by https://golang.org/cl/291711.
Fixes #44402.
Updates #44295.
Change-Id: I76f3e5577d1d24027d4ed2a725b5b749ab2d059c
Reviewed-on: https://go-review.googlesource.com/c/go/+/292629
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit
6f3da9d2f6b4f7dbbe5d15260d87ed2a84488fde)
Reviewed-on: https://go-review.googlesource.com/c/go/+/293843
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>