monitoring: grafana ux improvements

Created by: bobheadxi

• Refreshed homepage
  • everything now links to service dashboards - the warning/critical graphs, the table, etc. Just click!
  • upgraded table to get data links on the table cells. each table cell goes direct to the relevant graph panel
  • upgraded homepage graph to timeseries to avoid the annoying annotation prompt (https://github.com/grafana/grafana/issues/25580#issuecomment-805731081) when clicking to get to the link - doing this for the other dashboards was too hard though due to lack of support in the library, so those still use the old
• Refreshed container overviews
  • alerts panels now links to relevant graph panels - just click!
  • upgraded tables similar to above, table cells link to graph panels

Closes https://github.com/sourcegraph/sourcegraph/issues/16940

Also note that each panel already links to alert solutions and dashboard docs :)

Try it out:

kubectl port-forward svc/prometheus 9090:30090
sg run grafana