add vs coe glyphs and links to reduction tree
add vs coe glyphs and links to reduction tree

Summary: let's make it easier for users to spot possiblity to jump to source code from flipper

Reviewed By: priteshrnandgaonkar

Differential Revision: D26147686

fbshipit-source-id: 6e248c10e73f3b8fcd937d915af6e91db1fe6abe

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