Change Django secret key to make it more obvious it's a shim value

[AetherUnbound]

Description

This PR makes a quick change to the config for the local application to make it clear that the secret key which is used is not an erroneously exposed value used in live environments.

Testing Instructions

1. Change the key in your api/.env file locally if you have one
2. just a and check that the API is accessible & searchable at http://localhost:50270

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[krysal]

Making it a reminder to change it would be nice too.

Suggested change

	DJANGO_SECRET_KEY=example_key
	DJANGO_SECRET_KEY=example_key_CHANGE_IT_IN_PRODUCTION

[dhruvkb]

We can also update settings.py to raise an error if it's unchanged.

[AetherUnbound]

Thanks for the suggestion, and I like that idea @dhruvkb! I'll add an issue for it :)

[dhruvkb]

LGTM, with a suggestion for additional safety.

[dhruvkb]

We can also update settings.py to raise an error if it's unchanged.