Removes instances where we've feature flagged the new (current) design #2064
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What are the relevant tickets?
Closes #1864
Description (What does it do?)
This removes remnants of the old MITx Online visual design and eliminates checks for the feature flag that toggled between the two designs. It keeps the code that allows for checking for feature flags in the front end.
#1864 also specifies removing CSS and images from the old design but some pages still use elements of the old design, so this isn't done here.
How can this be tested?
Test against RC or production. The look and feel should not change; all UI elements should be there; there should be no changes for accessibility. Turning the new design off by flipping the feature flags, or blocking Posthog in some method (e.g. via an ad blocker), should not revert you back to the old design.