Use default site nav

PROBLEM

Currently, when attempting to get a list of all available sites, we rely on navigating to tempo news. This is a problem because it introduces a requirement that appian locust users can access tempo.

GOAL

Make it so that locust users don't have to be able to access tempo.

SOLUTION

Instead of using tempo to get site navigation information, we will use the users default site. We can navigate to /suite/, which will redirect us to the users default landing page, and from there decide to either use the tempo site or whatever site is their default to get site nav info.

NOTE: Only the second commit is from this branch.