Revert "DA - course dashboard recent activity"

This reverts commit aa73005690603c4f33b370178d4e47e950e2e373.

Change-Id: Ib5ed3f0381a2fe0d4eb6c6e6afcc95a46177903e
Reviewed-on: https://gerrit.instructure.com/41484
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Matthew Wheeler <mwheeler@instructure.com>
QA-Review: Matthew Wheeler <mwheeler@instructure.com>