feat: course about page markup and styles improvements

[bydawen]

Similar PR is opened to the master branch:
#33712

There is some fixes for the course about page:

• display a course short description in course about heading-group (if necessary)
• removing duplicated pre-requisite info in right sidebar
• code formatting for the block % if get_course_about_section(request, course, "prerequisites"):

Fixes were also made to the _course_about.scss styles, to fix responsive layout of the course about header element.

Before fixes:

After fixes:

[openedx-webhooks]

Thanks for the pull request, @bydawen!

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[bydawen]

Hi! I'm contributing on behalf of Raccoongang

[mariajgrimaldi]

Hi there @bydawen! We usually backport PR(s) after their corresponding master PR is merged. So we'll review this contribution against quince.master once that happens. Thanks!