progress-overview and progress-observations UI updates

ProgressGoalViews.js: Remove class
ProgressObservationViews.js: Add class name to view, toggle active
class on #domain-container click.
BarChartRow.html: Class and inline styling updates.
ProgressObservationsView.html: Add classes, update inline styling
ProgressOverviewView.html: Remove classes.
pd_pro.css: Add gradient background to .panel globally. Add styling to
"Progress" section.