Fix: minimum click area and minimal html

[Hornebom]

What I did

While going through the repository, I noticed that the styling of the LionButton makes sure that the click area is always at least 44x44px. This neat detail is not in place for the LionSwitchButton. To make this particular css available for both components, I extracted it into a dedicated file and imported it into LionButton and LionSwitchButton.

Further I noticed that the LionSwitchButton contains more html elements than actually needed. The styles from the .btn and .switch-button__track can easily be used on :host. In that way there's less css to maintain and less html in the dom.

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Latest commit: 62012ff

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