Add progress bar

[Lithl]

There should be a progress bar at the top of the page which indicates how many different color identities have decks set. Identities with multiple decks should only count once.

[Elonex777]

Good job @Lithl it work, the fact that we need to hover mouse to see it might be a bit weird but i guess we could adress this when the whole ui is there like website logo, settings button language icon etc...

[Lithl]

004540a extends the hover area from 4px to 30px.

The non-hover height is in compliance with Material design, which I am conforming to for the most part.