Added Access control for admins / course instructors

[M97Chahboun]

fix #19

• Fix create new user issue

[M97Chahboun]

@alexeygrigorev Please check this PR and let me know if you have any notes/issues

[M97Chahboun]

@alexeygrigorev quick reminder.

[alexeygrigorev]

Apologies for the delay

I'm trying to run it and this is what happens:

Traceback (most recent call last):
  File "C:\Users\alexe\Anaconda3\lib\threading.py", line 980, in _bootstrap_inner
    self.run()
  File "C:\Users\alexe\Anaconda3\lib\threading.py", line 917, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\alexe\.virtualenvs\course-management-platform-wiAsnpQu\lib\site-packages\django\utils\autoreload.py", line 64, in wrapper
    fn(*args, **kwargs)
  File "C:\Users\alexe\.virtualenvs\course-management-platform-wiAsnpQu\lib\site-packages\django\core\management\commands\runserver.py", line 133, in inner_run
    self.check(display_num_errors=True)
  File "C:\Users\alexe\.virtualenvs\course-management-platform-wiAsnpQu\lib\site-packages\django\core\management\base.py", line 556, in check
    raise SystemCheckError(msg)
django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

ERRORS:
<function ManyToManyField.contribute_to_class.<locals>.resolve_through_model at 0x000001AAA2F65EE0>: (models.E022) <function ManyToManyField.contribute_to_class.<locals>.resolve_through_model at 0x000001AAA2F65EE0> contains a lazy reference to courses.instructor, but app 'courses' doesn't provide model 'instructor'.
courses.Course.instructor: (fields.E331) Field specifies a many-to-many relation through model 'Instructor', which has not been installed.

System check identified 2 issues (0 silenced).

Have you encountered it?

[M97Chahboun]

@alexeygrigorev NP I will check it today

[alexeygrigorev]

@copilot can you update to the latest main, check the code, make sure we have sufficient amount of test and the implementation makes sense

[M97Chahboun]

@alexeygrigorev I believe we should consider adding Ruff rules to our project for formatting and linting. This would help ensure consistent code quality and make it easier for contributors to adhere to our style guidelines. What do you think about implementing this?

[M97Chahboun]

Adds sidebar items icons

[M97Chahboun]

for superusers