fix: change buttons in wiki modal to anchor tags
fix: change buttons in wiki modal to anchor tags

The action buttons in wiki modal have href attribute
but do not have an event listener for click.
This PR changes the buttons to anchor tags so that they
work as expected when clicked.

angelapper/edx-platform,arbrandes/edx-platform,edx/edx-platform,edx/edx-platform,edx/edx-platform,arbrandes/edx-platform,edx/edx-platform,eduNEXT/edx-platform,eduNEXT/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,angelapper/edx-platform,arbrandes/edx-platform,arbrandes/edx-platform