Scope scroll-depth to only `#maincontent`

Instead of using the entire page scroll depth, do some fancy math to determine scroll depth of `#maincontent`. This avoids potential data distrust caused when users don't scroll the entire footer, for example.
Remove baseline tracking, it distorts the averages.
Bring back the footer banner for visual umph.
Whitespace and tab correction.
Move footer floater to an include.
Move breadcrumbs to its own file, standardize colors.
use correct path for include.
Remove unnecessary function.
Merge pull request #438 from smeranda/scroll-tweaks

Setup scroll-depth tracking to only focus on `#maincontent`
Add font icons for contact options.
Add styling for contact us options.
Remove outdated design files.
Rename file.
Test for scrolling on iOS. #failed
Smaller footer font size.
Return of the InstanceEditable comments.
Destroy the unl_sso global cookie if the user's CAS session has ended
Support for related links band.

This will allow related links to be variable in length and optional if the WDN goes that route.
Remove unnecessary files.
Restructure footer to allow banded related links.