Update `webpack-dev-server` dependency to `@latest`

The `webpack-dev-server` dependency cannot be updated to the `@latest` version. More might be broken, but currently it looks like the use of the `https` key on the following line has to be replaced with something else.

https://github.com/ssoelvsten/wordrow/blob/1a94e3275a8fdf6e53b09bd3c315ba2c44d089f8/game/config/webpackDevServer.config.js#L94

Doing this would also resolve #156 