Frontend: Sets up MetricConfig for Maternal Mortality

[JDemlow]

Description and Motivation

Closes #3306

Has this been tested? How?

Using integrated terminal and browser

Screenshots (if appropriate)

Types of changes

(leave all that apply)

• New content or feature

New frontend preview link is below in the Netlify comment 😎

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[JDemlow]

Only files showing as changed are related to MM. Should be good now!