Make the course URL pattern more generic.
Comment newly added functionality.
Fix quality issues.
Address two lint errors, with regex and variable naming.
Changed how we access course_key and course_id.
Replace another instance of self.course.id.to_deprecated_string()
Remove unused import, add missing one.
Improve how the ccx key is extracted from the URL
Use resolve() instead of os.path to get the course_id.
Remove the granting of staff access to coaches.
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