External link fields not available in Degrees post type

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Discussing with Ryan the need for this. Hold on it for now.

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From Ryan:

Use case is for interdisciplinary (cross divisional) degree programs in CSP and PBSE
They have their own websites that we don't 100% control and can't host all the info (nor want to).

There are 5 degrees in this category and about 3 more that will be approved in 2020