Move sandcastle-build.sh to facebook folder
Move sandcastle-build.sh to facebook folder

Summary: Now we won't need the shipit config to exclude it anymore

Reviewed By: passy

Differential Revision: D9049518

fbshipit-source-id: 983bc28fc3dce7543c9100992f2daff1dd783ea3

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper