Disabled student view if course is not yet released for students.
LMS-6617

Fixed wiki merge url regex.
TNL-413

ECOM-345 changed any lists that could display with only 1 item to divs

ECOM-345 Added aria tags for header

ECOM-364 Accessibility update for footer

added my name to the authors file

Addressing feedback from code review - removing unnecessary element references in selectors

Updated header aria-label to be main
Merge pull request #5333 from edx/alasdair/header-footer-accessibility-updates

Alasdair/header footer accessibility updates