Remove items from the shopping cart if they are for a course whose course enrollment window has closed

changed the url name to verify_cart and change the color of the message in the shopping cart
Added IMG tag instead of css background property for important visual indicator.
TNL-892
Merge pull request #6114 from edx/waheed/tnl892-fix-css-background-image-for-important-visual-indicator

Added IMG tag instead of css background property for important visual indicator.
Merge pull request #6124 from edx/muhhshoaib/WL-164

Unpurchased items in the shoppingcart should be removed if the enrollment period has closed
Load OVA JS with requireJS in LMS.
Merge pull request #5829 from edx/jmclaus/load_ova_js_from_templates_with_requirejs

In LMS, load OVA JS only in four OVA templates with requireJS. [TNL-693-outdated]
Rename legacy dash template
Remove Grade Adjustment code from legacy dash
Clean up Grade Downloads section of legacy dash
Clean up Admin section of legacy dashboard
Clean up Forum Admin section of legacy dashboard
Clean up Email section of legacy dashboard
Add CSS rules for legacy dash deprecation warnings
Clean up Manage Groups section on legacy dashboard
Remove deprecated cohorts management on legacy dashboard
Clean up Datadump section on legacy dashboard
Only show "Course Statistics at a Glance" in the Admin tab
LMS: adding in basic is-deprecated visual styling
Style cleanups: legacy instructor dashboard