remove Building with Skia Tutorial

It's mostly "How to Effectively Fight with GYP", which is no longer interesting.

BUG=skia:6043

NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=5761

Change-Id: I760e8d9c6577846b34d8f1f0d2e37b5a3c553ccf
Reviewed-on: https://skia-review.googlesource.com/5761
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed