Add DEFAULT_FROM_EMAIL setting handling

[sarayourfriend]

Fixes

Fixes #676 by @AetherUnbound

Description

Adds the setting from the issue.

Testing Instructions

🤷 Not sure how to test this locally. You could set the environment variable then use manage.py shell to check if it is set.

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[AetherUnbound]

The Django default is webmaster@localhost, did we want to mirror that here so it's more obvious when this isn't set?

[sarayourfriend]

Personally I'd vote for this group of required email settings to not have defaults unless some parent setting was turned off.

if config("ENABLE_EMAIL", default=True, cast=bool):
    DEFAULT_FROM_EMAIL = config("DEFAULT_FROM_EMAIL")  # no default! This should be an error if you don't supply it
    # etc...

[AetherUnbound]

I love this!

[AetherUnbound]

Thanks for jumping on this @sarayourfriend! This can be merged, but I like your suggestion about an ENABLE_EMAIL setting 💯