Use official webpack config for rax

[lleohao]

Is your feature request related to a problem? Please describe
Rax framework has many unique capabilities, such as rpx unit.
We need to achieve it.

Describe the solution you'd like
Get webpack config from rax.

Official config

• rax-webpack-config
• rax-babel-config

Describe alternatives you've considered
Copy config from rax

Are you able to assist to bring the feature to reality?
yes, I can...