Add static storybook build

[andypost]

There's https://storybook.js.org/docs/basics/exporting-storybook/

We could create storybook directory inside of theme and echo the link to it in deploy step if theme has this directory with index.html

[hog-seruj]

PRs: #196
skilld-labs/kaizen#117

[andypost]

I mean it should be part of CI as well