divider: evaluate to use hr HTML tag

[mfranzke]

    If I understand this component correctly, a [`hr`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/hr) tag might be a semantically better fit than a `div`.

Originally posted by @mfranzke in https://github.com/db-ui/mono/pull/10#discussion_r1036234440

[nmerget]

I tried this at first, but the issue was with the vertical divider.
Maybe you could look at this as well?

[d-koppenhagen]

Not sure about this. It depends on the usage I would say.
If the divider is used for semantically separating conents, I would agree to use <hr>. But: if it's used simply for styling things, <hr> is probably not the correct tag to use.

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/hr says:

Historically, this has been presented as a horizontal rule or line. While it may still be displayed as a horizontal rule in visual browsers, this element is now defined in semantic terms, rather than presentational terms, so if you wish to draw a horizontal line, you should do so using appropriate CSS.

In my opinion using a div here is totally ok.