Feature: Add support for running capacitor on a subpath

[jack1902]

It would be great if capacitor supported running on /some/path instead of assuming it has /. Whilst i understand this could be achieved by using a reverse-proxy such as nginx to map /some/path back to /, i'd still like the option of configuring things such that i can use different ingress-controllers (namely the AWS LB Controller which spins up an ALB which has no support for remapping URL')

I can see that this should be possible with the addition of:

• "homepage": "." within package.json to make the static assets support relative subpaths
  • https://create-react-app.dev/docs/deployment/#serving-the-same-build-from-different-paths
• use r.Mount("path-from-env-var", method) - essentially we can either extend all paths with an env-var, or create a router on a path to then mount a secondary router such that everything can be configured to run on a path
  • https://pkg.go.dev/github.com/go-chi/chi#Router.Mount