Remove dashboard auto refresh (#1511)

Closes #1510.

* Remove refresh interval screenshot
* Remove auto-refresh button from images

Co-authored-by: pierwill <pierwill@users.noreply.github.com>
Co-authored-by: Scott Anderson <scott@influxdata.com>

content/influxdb/v2.0/visualize-data/dashboards/control-dashboard.md

@@ -33,12 +33,6 @@ Click the timezone dropdown to select a timezone to use for the dashboard. Selec
 
 {{< img-hd src="/img/influxdb/2-0-controls-timezone.png" alt="Select timezone" />}}
 
-### Select auto-refresh interval
-
-Select how frequently to refresh the dashboard's data. By default, refreshing is paused.
-
-{{< img-hd src="/img/influxdb/2-0-controls-refresh-interval.png" alt="Select refresh interval" />}}
-
 ### Manually refresh dashboard
 
 Click the refresh button (**{{< icon "refresh" >}}**) to manually refresh the dashboard's data.