feat: course about page markup and styles improvements

[ihor-romaniuk]

Similar PR is opened to the open-release/palm branch:

• quince feat: course about page markup and styles improvements #33791
• master feat: course about page markup and styles improvements #33712

Description

There are 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, @ihor-romaniuk!

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