Fix the Storybook setup with Saka

[pureooze]

A while back I added Storybook support for Saka but it never fully worked. There were issues with missing css (like icons) as well as some issues with mocking the browser APIs when rendering certain components. On top of that the storybook build ended up breaking when I upgraded the project to Webpack 4.

I have managed to get most of the stuff mentioned above working in a branch here: https://github.com/pureooze/saka/tree/storybook-fix

There are however still some minor issues to iron out so this issue is to keep track of the work to get Storybook working again. I also thought this would be a good way for others to provide suggestions/feedback for how Storybook should be used with Saka.

[pureooze]

Since we use Webpack 4 we will need to wait till Storybook hits 4.0 for compatibility.

[pureooze]

For reference: https://dev.to/nickytonline/setting-up-storybook-for-preact-p5a