Move ANGLE wrangler documentation Update infra/README.md with relevant moved info and remove obsolete. Bug: b/407512213 Change-Id: Ia6e480b060d3bfae465974f76453d93790c93386 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6424754 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Auto-Submit: Yuly Novikov <ynovikov@chromium.org>