Remove webpack-cli dep in favor of webpack-command

[alexilyaev]

Installed webpack-command, but webpack-dev-server still needs webpack-cli:

• Implicit dependency on webpack-cli webpack/webpack-dev-server#1422
• Not respecting context in webpack.config.js webpack-contrib/webpack-command#36

Edit:
Did Webpack stop recommending webpack-command?

[shellscape]

If older browser support isn't required, move to webpack-serve instead of webpack-dev-server which does not depend upon webpack-cli.