Add option to show SourceIndicator in PageHeader
Add option to show SourceIndicator in PageHeader

Trying to keep this thing DRY, since the source indicator is present on
a lot of pages

influxdata/influxdb,influxdb/influxdb,influxdb/influxdb,li-ang/influxdb,nooproblem/influxdb,nooproblem/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,nooproblem/influxdb,influxdata/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,li-ang/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb