Improve / Investigate Storybook <-> Vue integration

[davinotdavid]

Is your feature request related to a problem? Please describe.
As @devmount pointed out, Storybook currently doesn't show our custom template with slots when clicking "show code". This is odd and there is probably a better way to make it more accurate with the actual code.

Example, in this case it doesn't show the icon set in the named template "icon":

Describe the solution you'd like
When seeing code through the Storybook interface, we should be able to see a more accurate code representation of the custom templates / slots applied.

[MelissaAutumn]

Yeah, it's not ideal. I had to do some hackery to get things to work nicely in the buttons I believe. For now we can manually write code examples.

https://github.com/thunderbird/services-ui/blob/main/src/elements/BaseButton.stories.ts#L39