Bug 1546733 - [Card] Place source above title and adjust vertical spacing

[gvn]

QA: Run dev-test-all layout and compare to requests in 1546733

[ScottDowne]

Putting that link at the bottom had some flexbox usage to do right.

Do we still need it? I'm wondering if we can kill them. I see:

.ds-card-link with:

display: flex;
flex-direction: column;
justify-content: space-between;

and .meta with:

display: flex;
flex-direction: column;
flex-grow: 1;

The above was only there to make that soure text float on the bottom of the card, I think.

Also, .info-wrap has a margin: 0 0 12px; and flex-grow: 1; that I wonder if we still need.

[ScottDowne]

R+if you file a followup for 69 to cleanup dead css.