Make description page link and reuse widget more prominent

Rearrange the above-the-fold part of the metadata panel so that
the link to the file descriprion page and the button for the
download/share/embed widgets are easier to find.

One gotcha is that favicons are blown up to 32x32px (a small icon
in the middle of a big empty space would really look ridiculous)
so if a site uses 16x16px favicons it will look pixelated.
None of the WMF sites do that though, and if anyone else does, they
should just fix it, 16px favicons suck anyway (e.g. not retina friendly).

Change-Id: Icce12174b6ed89731fe75f8069c0b4a2b7161a34
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/732
Make above-the-fold buttons take up more vertical space

Change-Id: Id38f4a8dace2818133d659e60036cd0f826665b4
Use absolute positioning for progress bar to stop pushing down content

Change-Id: I518d88f005506813325f6577450eda0ab1c8cd35
Merge "Make description page link and reuse widget more prominent"
Merge "Make above-the-fold buttons take up more vertical space"
Merge "Use absolute positioning for progress bar to stop pushing down content"