feat(elements): show tags description if exist

[Airkro]

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[marcelstoer]

I understand the discussion about the feasibility of putting the description into the HTML title attribute. I absolutely support the initial implementation idea even if I acknowledge its shortcomings. It's not something that supports all possible use cases.

To see what we're talking about, I quickly hacked two title variants (single line, multi-line) into the GitHub API on the Elements demo instance. Testing was done with Firefox on the Mac. I find both results totally acceptable.

To improve on this, one would need to render a tooltip icon (aka info icon) with a proper highlight behavior. However, this would feel unnatural IMO as Elements doesn't have such icons in its design language AFAICS.