feat(js/main_live): remove the annotations if any previous line is changed
feat(js/main_live): remove the annotations if any previous line is changed

close #31

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