feat(elisp/ob-lean.el): remove unused file
feat(elisp/ob-lean.el): remove unused file

soonhokong/lean-tutorial,soonhokong/lean-tutorial,Hodapp87/cs6460_project,cjmazey/fork_leanprover_tutorial,soonhokong/lean-tutorial,avigad/tutorial,leanprover/tutorial,leanprover/tutorial,cjmazey/fork_leanprover_tutorial,cjmazey/fork_leanprover_tutorial,avigad/tutorial,Hodapp87/cs6460_project,fpvandoorn/tutorial,leanprover/tutorial,fpvandoorn/tutorial,avigad/tutorial,fpvandoorn/tutorial,Hodapp87/cs6460_project