Changed <aside> tag to <div> tag according to the accessibility guidelines
mentioned in AXE 3.3
<aside> tag should not be a child of <main> hence replaced the
<aside> tag with the <div> tag.
The new design for the program detail page introduced a sidebar which includes a program-specific listing of credentials. This is an improvement over the old list of credentials found on the program list page and is meant to replace it. The new detail page is stable, so the credential listing on the program list page can be removed.
LEARNER-492
