How to specify the sub-path of console

[moliqingwa]

What would you like to be added: While configuring my new kubesphere console setup, I had to spend some time figuring out how to get the kubesphere UI to correctly serve on a sub-path, e.g. example.com/kubeshpere/

Why is this needed: Because we want to expose all console web UI to use one host address, Thanks anyway:)

[zheng1]

/assign @harrisonliu5