DJANGO_SECRET generation

[fgibertoni]

Description

• Added new generation of DJANGO_SECRET in initialize.sh. The secret key is now required to run the project.
• .env.start.test is now loaded only in test mode.
• Updated docs.

Type of change

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• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

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[fgibertoni]

The broken analysis is DeepSource for start.py. The script is going to be removed so I think we can ignore the error.