Update environment variables docs

[jtquach1]

Describe your changes

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Updated environment variables used in mcode/rems-smart-on-fhir#105 and mcode/pims#86

Issue ticket number and Jira link

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https://jira.mitre.org/browse/REMS-710
https://jira.mitre.org/browse/REMS-712

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[jtquach1]

This is rebased off rems-intermediary-mongo currently since I'm using Docker Compose to run MongoDB