<button> tag is semantically wrong element for a11y

[jackahl]

We should replace the element at

volto-button-block/src/components/View.jsx

Line 38 in 2c32645

<Button className={(cx('button'), data.align)}>

or set a as="span" prop because semantically this block is just a link and not a html button. Having buttons within links is very confusing when navigating the page via keyboard and definitely a a11y violation.