Added default-config API route

[nandhinibsn]

Description:

Added a new API route called "admin/default_config" to fetch the default config details of Azimuth.

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[gabegma]

Awesome work! My only thought is that we might want to get the default for other languages? Right now, there are the defaults for the English config only.

[gabegma]

LGTM! Good job on your first PR in the back end!!

[nandhinibsn]

Thank you Gab and Joseph :)