Consume navbar as block component to support login button.
Consume navbar as block component to support login button.

For now, this sends the user to some other OSF page, then they go back to the page in the address bar.

[ci skip]
[#PREP-87]

pattisdr/ember-preprints,caneruguz/ember-preprints,caneruguz/ember-preprints,hmoco/ember-preprints,laurenrevere/ember-preprints,CenterForOpenScience/ember-preprints,CenterForOpenScience/ember-preprints,baylee-d/ember-preprints,baylee-d/ember-preprints,laurenrevere/ember-preprints,pattisdr/ember-preprints,hmoco/ember-preprints