fix(js/main_live.js): enforce https only in hostnames with 'lean'
fix(js/main_live.js): enforce https only in hostnames with 'lean'

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