at-a-glance: link updates to reflect dashboard name changes

at-a-glance: link updates to reflect dashboard name changes

In addition to the link updates
- scrub state reflects both scrub and deep-scrub status
- the scrub panel no longer turns to "warn" when scrub is active - it's
  a natural feature of the cluster and not a problem! However, it will
  turn red, if scrub or deep-scrub is disabled
- disk util panel changed to a graph and switched to average and 95%ile
  (95%ile on a busy cluster just shows too much variance)
- OSDs panel now links to the ceph-osd-information dashboard