Link should get a <button variant

[petemill]

Link component should be allowed to render <button so that we can avoid developers using <Link href="#".

This plan is approved by @AlanBreck and @fallaciousreasoning

[fallaciousreasoning]

This should involve rendering a

<svelte:element this={isButton ? 'button' : 'a'}>
    ...
</svelte:element>

https://learn.svelte.dev/tutorial/svelte-element

[jonathansampson]

Instead of svelte:element, would it not be easier to pull in https://github.com/brave/leo/blob/main/src/components/button/button.svelte to return an actual button when isButton is set/true? Otherwise, it seems we'll have quite a bit of work to maintain button-aesthetics across the two components.

[fallaciousreasoning]

I think the point of this one is to not maintain the button aesthetics - it should always look like a link here