Removed redundant @storybook/addon-docs dev dependency (#8184)
@storybook/addon-docs was included as a dev dependency, and imported
into the config. This is now part of
[addon-essentials](https://storybook.js.org/docs/essentials) and
therefore it's inclusion here is redundant.
With addon-docs as a separate, additional dependency, storybook would
throw `TypeError: Failed to fetch dynamically imported module` when
importing mdx files, making it impossible to add custom documentation.
Co-authored-by: Nick Evesham <nick.evesham@gembaadvantage.com>
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>