Aligning the header and footer CSS style rules with those of Orangelight

[jrgriffiniii]

Resolves #421

[coveralls]

Coverage remained the same at 100.0% when pulling 5316ebb on issues-421-jrgriffiniii-rebrand-header-footer into a9b5fd3 on master.

[escowles]

This is a good start — I think the main other thing we should do is pull the "Digtal PUL" header into the black header bar the way that OL does with "Catalog".

[hackartisan]

The place where it says "Digital PUL" is used on collection pages to show the collection name. So we'll need to make sure not to remove the area altogether; i guess just on index.

[jrgriffiniii]

Should the responsive search input element also be resized and shifted? It seems to be significantly wider on Orangelight:

[escowles]

I think it's fine to leave the search box as-is to allow more space for browse page titles.

[sdellis]

I suggest using the LUX header/footer to keep it in sync with other apps.

[escowles]

@sdellis I think we'll start using Lux as part of #440 — hopefully early in 2019.