feat: course id fields restriction & js uncaught element bug fixed #46
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Description
Added a JavaScript file that restricts the course ID fields in the enrollment form and product form for Open edX courses, to make the "course-v1:" string at the beginning mandatory. Also, while running the JavaScript code, there were some error messages appearing in the console because the code was trying to get an element that was not present on the page. To fix this issue, an if structure was added to the code to verify if the element is present on the page before using it.
Testing instructions
Go to the enrollment form and the product page and try to modify the course ID.
Checklist for Merge