Use system checks for verifying that application is configured correctly

[abhiabhi94]

Proposed Functionality

As of now, we use checks for some functionalities to check if the application is configured correctly or not. For example see the code for verifying the order used to display comments.

Use Case

Although this works, this check is run on every incoming request that uses this part of the code. This isn't necessary because in most cases(especially in production), the configurations aren't expected to change for every request. We can probably use Django's Systems check framework to do handle this in a more efficient way.

Potential wins

From the documentation

The system check framework is a set of static checks for validating Django projects. It detects common problems and provides hints for how to fix them. The framework is extensible so you can easily add your own checks.
Checks can be triggered explicitly via the check command. Checks are triggered implicitly before most commands, including runserver and migrate. For performance reasons, checks are not run as part of the WSGI stack that is used in deployment. If you need to run system checks on your deployment server, trigger them explicitly using check.

Database Changes

None

[abhiabhi94]

closed in #235.