Update backend README for simplified development database setup#871

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jmoggr wants to merge 3 commits intocc-utils-scriptfrom

Commits on Nov 26, 2025

Use database setup script for setting up development database
Jason Moggridge
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ENH: Make setting DATABASE_SUPERUSER_URL env var optional
Jason Moggridge
committed
DOC: Update backend docs for development database setup
Jason Moggridge
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