ActiveJobs: Make navbar configurable at runtime with same color options like the dashboard

[ericfranz]

Relevant commits/files include:

1. https://github.com/OSC/ood-dashboard/commit/b1c52db2bd70353353381d7bae290771a42b4ef4
2. https://github.com/OSC/ood-dashboard/commit/64c85324163172d44e821536a100481c8c05d893

We should consider adding the shared partial to ood_appkit and using that in MyJobs and ActiveJobs.

This would be a runtime-only config feature.

┆Issue is synchronized with this Asana task by Unito

[ericfranz]

Instead, a better solution would be to have a shared stylesheet that the OnDemand core apps can use (or even move active jobs into the same Rails process as the dashboard app). This will be easier to do once we move to a single repo.

[johrstrom]

Yea one complaint we've gotten is the navbar being so different, it throws folks off. There's also #228 to split the navbar in 2. Mabye we share 1 entirely (what's in the dashboard) and every app enables the second one.