Load Generic Card data models and expose them via the Gatsby API

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Description

In #547, Jason developed the capability for a generic card template on the code side. We now want to link this to our CMS.

I've gone into our CMS to create a data model with the same fields. This issue involves loading this new data model into Gatsby à la #536 and #571.

Recall or reference that these are the generic card fields Jason worked in in #547:

• image - In our CMS, this is a "media asset" type which contains an image, alt text, etc. (See Feat: Load Media Asset Data Model into Gatsby #571).
• imageShape - Our CMS will pass this as a string either "rectangle" or "circle"
• title - string
• subtitle - string
• bodyText - markdown field
• borderColor - hex code
• bodyColor - hex code

Note: this issue necessitates closing #616 without resolution because we're now adding "What We Do" pages using generic cards instead of an "activity" data model.

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