Bug reproduction

Create web component scaffolding with demoing

$ npm init @open-wc
# web component scaffolding > demoing

Add a public statics assets folder and use it in a story

$ mkdir public
# I coppied kitten.jpg in public/kitten.jpg

On index.stories.mdx I added:

## Kitten image
<img src="public/kitten.jpg"/>

Start storybook

$ npm run storybook
> start-storybook --node-resolve --watch --open

It works! 🎉

Build storybook
```
$ npm run storybook:build
> build-storybook -s public
```
It doesn't work /public folder is not copied. The -s flag shouldn't even be needed because /public is the default static folder. The kitten image throws a 404 error when serving /storybook-static
Not elegant solution for now In pakage.json
```
"poststorybook:build": "cp -R public storybook-static/public"
```
I'm sure something similar can be done ad-hoc for rollup config too. However this shouldn't be needed.

<demo-static-files-bug>

This webcomponent follows the open-wc recommendation.

npm i demo-static-files-bug

<script type="module">
  import 'demo-static-files-bug/demo-static-files-bug.js';
</script>

<demo-static-files-bug></demo-static-files-bug>

To run a local instance of Storybook for your component, run

npm run storybook

To build a production version of Storybook, run

npm run storybook:build

npm start

To run a local development server that serves the basic demo located in demo/index.html

npm start:compatibility

To run a local development server in compatibility mode for older browsers that serves the basic demo located in demo/index.html