Help Button is NOT labelled for accessibility readers

[qqmmm]

Describe the bug
The "Help" button is not labeled on the instructor view of the course home page. When I was using a screen reader to do the accessibility audit of the page, it would only read it as a "button" without saying what the button was for.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Course home page', and find the question mark at the right corner
   It is located on every page of the course overview.

Expected behavior
It should read it as "help button", or "click here for help"

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• Win
• Chrome
• Version: [e.g. 22]

Additional context
Add any other context about the problem here, for instance a full link to the page or resource if this problem is specific to a course or a resource in a course.
https://proton.oli.cmu.edu/sections/introduction_to_learning_engin_nu6db/instructor_dashboard/overview

[cjlim1092]

Note to team: this is filed by our accessibility intern who is doing an accessibility audit

[github-actions]

https://eliterate.atlassian.net/browse/MER-2726