Add CI/CD using Github Actions for linting and building the Django app

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Description

This PR adds a CI/CD pipeline using Github Actions for linting (using flake8) and building the Django app. It also implements a pre-commit approach at the linting phase. Additionally, it includes a CD pipeline to deliver the app to DockerHub.

Summary of Changes

• Added a Github Actions workflow file (.github/workflows/ci_cd.yml) to define the CI/CD pipeline.
• Installed flake8 and added linting steps in the workflow to check the code for linting errors.
• Added steps in the workflow to build the Django app.
• Added steps in the workflow to push the built app to DockerHub for deployment.
• Created a .flake8 file to configure flake8 for linting.
• Created a .pre-commit-config.yaml file to configure pre-commit for linting.
• Modified requirements.txt to include flake8 as a requirement.

Fixes #6.

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