Define and document the MediaTag component

[dhruvkb]

Please merge #127 before this

Description

This PR adds the MediaTag component that represents one tag associated with a media item.

Screenshots

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[zackkrida]

Great, just a few things:

• We should only have a hover state if the element is a link/button/etc. these can also potentially be used just to display a non-interactive tag.
• All hover styles should also apply on focus
• The hover state is not documented and I discussed a bit with @panchovm, the final hover state would more likely be dark grey background with light text.

[fcoveram]

We don't plan to use this component as a link to filter/navigate the search results, so we should not have the link states. This might change, but I suggest keeping it as simple as possible. I'm tasked with the single result mockup where this element will be.