Run under subpath

[JackBailey]

Hi, it looks like the caddy subpath config no longer works.

I'm trying to do the same with the beta branch, and nomatter what, wizarr doesn't seem to work with this anymore - everything is a 404. I assume this is just because "/wizarr/admin" !== "/admin", therefore 404.

The files load fine, it's just the routing. Not sure if I'm missing anything, if it's not user error, I can create an issue.