style(identities): Improve indication of Account Username.

[gtandersen]

Third attempt :)

[castaway]

I think this looks a bit odd in the "Email" section, can we just add it to the top of the entire card instead? @runboxdave thoughts? (see first image)

[runboxdave]

Yes, it would possibly look better at the top of the entire card as you say.

[gtandersen]

Something like this perhaps?