Different Variant styles for Buttons

[nicosammito]

Like Bootstrap outline, normal

[nicosammito]

Currently, we just support the filled style with a border. We should also support just the border in the variant color and without a border.

We should call those styles: normal, filled and outlined

[nicosammito]

We should also support variant none which sets no border and no background. On hover and focus the linked color is set with border and background.

All variants should react to focus and hover