The application pages should scroll but leave the header/sidenav in place

[chrabyrd]

Currently, the concept/scheme page allows the user to scroll the entire page, losing the header/sidenav in the process. This should be corrected to keep those elements in place.

This will likely be done by giving the outermost content panel div a height based on vh. If possible we should avoid calc-ing the header height, but that may need somewhat deeper changes.