Learner Dashboard has a broken skip link #510
Description
description
frontend-component-header has, correctly, a Skip to main content link that goes to href=main. However, Learner dashboard has a main element with no ID, so the skip link fails. This is an accessibility issue; it's a violation of WCAG 2.4.1 (and is also just a broken link). This can almost certainly be easily fixed by adding id=main to the main element.
acceptance criteria
a keyboard or screen reader user who loads the page will have the first link be "Skip to main content", and activating that link should take the keyboard or screen reader focus to the primary block (for keyboard users it will be the "my courses" first reachable element, which I believe is the "refine" button; for screen reader users I believe there is the invisible announcement "learner home" followed by the rest of the "my courses" component).