revise return from stage screen to start screen bug, remove two alerts, comment uglyfy
Revert "revise return from stage screen to start screen bug, remove two alerts, comment uglyfy"

This reverts commit 6440100ed941e12ab7f17d1a1d77dd775badcf83.
Merge branch 'master' of https://github.com/AdformAcademy/fight-game