remove no longer used links from directory

BUG=skia:

NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=8914

Change-Id: I8497764cf12c0a0df96ea559f0595365d76252a3
Reviewed-on: https://skia-review.googlesource.com/8914
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed