Feat/toggle group improvements

[ChrisPaj]

recommended changes: fix singleSelect story, add story with icons, make selected icon solid, renamings and css stuff

[render]

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[acstll]

From a code point of view, I think this is good to go. Let's wait to QA/design 🤓

[timheiler-ico]

Its about the stories:

– can the default border be "on" please?

– i want to see only stories for toggle group. The is only a sub component and must not be used outside the group. Will not have "usage" outside the group either.

– story naming is not aligned with properties any more (story "secondary" shows button-variant "white-background" -> story should be called "white background"... and the likes.)

– code examples contain wrong code e.g.
<scale-toggle-group variant='secondary' disabled>

– icons-story: please don't mix "before / after / only" in one story (not a good example)
please add:

1. icon before
2. icon only (include aria title on icon!!)
   "icon after" is not a case we'd recommend.

– not able to see the cases of e.g. xs with icons.

– story single select more prominent. (3rd place maybe?)

– add story for "Color Scheme Dark"

and little bits of design:

– design: disable border: color

– check & adjust element roundings

[render]

Your Render PR Server URL is https://scale-storybook-staging-pr-507.onrender.com.

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[render]

Your Render PR Server URL is https://scale-storybook-staging-pr-507-c3pn.onrender.com.

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