fix(96): address icons not loading

[jlandrum]

Summary

This PR fixes/implements the following bugs/features

• Update Storybook to 6.5.15 to match the current version for emulsify-drupal
• Move static dirs from package.json using the deprecated -s flag to .storybook/main.js to allow static folders to be included in deploy.

This fixes icons (and possibly other static assets) not being included when running storybook:deploy, which does not accept a static dirs flag and thus does not process static assets.

How to review this pull request

• [x] Clone branch
• [x] Run npm run develop
• [x] Verify icons are loaded: http://localhost:6006/?path=/story/atoms-images--icons
• [x] Run npm run storybook:build
• [x] Verify assets appear in .out directory
• [x] Open .out/index.html and verify icons are loaded under Atoms / Images / Icons.

Closing issues

Closes #96

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:tada: This PR is included in version 1.16.3 :tada:

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