fix(routing): not found main.js & remoteEntry.js

[barsheshet]

If landing on a "deep" route path like /profile/foo/bar, main.js and remoteEntry.js assets are not found. The problem is that script tags src in the HTML are not absolute (main.js instead of /main.js).

This can be solved by either:

• change publicPath from auto to a "hard-coded" URL (ie. http://localhost:3001/).
• use HashRouter.

Is there any better solution? Yes! change publicPath in html-webpack-plugin to be /. This works just fine for me.

I know, it might be a problem with how html-webpack-plugin treat auto. Until we find out if it is, and create a PR, this is not a bad workaround :)

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