Changes for LMS-2591, Instructor Dash switchover

[lamagnifica]

@sarina, instructor dashboard changeover. (No screen shots were affected by this change! Minimal text changes needed.)
@mhoeber, @srpearce , please copy edit and proofread changes.

[srpearce]

👍

[mhoeber]

👍 definitely want a change log entry for dashboard switch

[sarina]

@mhoeber it's the engineering team responsibility ot make a changelog entry, I thought? we already made one w/ the original PR.

[lamagnifica]

@sarina I think @mhoeber is talking about the change_log.rst file that lives under the docs/en_us/course_authors branch

[sarina]

LGTM! 👍

Quick Q: do we have any documentation on anything that lives in the legacy dashboard?

[lamagnifica]

@sarina no, we do not. Early on @shnayder and @mhoeber and I agreed that only New dash features would be documented. (I also searched the guide for "standard" to be sure)

[sarina]

Great! Just wanted to make sure :)