Revert "create stackexchange handlebars template"

This reverts commit 899f0ec3ed0d35723c7e8ffd519e5095dd799cb1.
Revert "create stackexchange onebox spec"

This reverts commit 097ccb3fe1c0f581244706eeb9531a217347659f.
Revert "create stackexchange onebox"

This reverts commit 207f558cee3dd3cd4a539417cb7cf8ee003e9283.
fix stackexchange conflicts in preview