Sorry in advance for the low tech question. I am currently running an old prophoto theme that is mobile unfriendly and very slow. I want to redo my site with GP, but don’t want my site to be down while I am redoing it with GP. Will my current site be replaced with GP if I make it my active theme. Sorry if the simplicity of this question makes you cringe. I realize I may be trying to do something that would be better left to folks who do this as a profession.