docs: update documentation to reflect monolith recipe architecture

Jim Birchrequested to merge
issue/healthcare-3578112:3578112-update-documentation-after into 1.x
  • Clarify this is a monolith Site recipe, not a traditional recipe
  • Add detailed development workflow using DDEV and drush site:export
  • Expand module list to reflect complete dependency set (120+ modules)
  • Document proper installation process with DDEV
  • Explain monolith vs traditional recipe architecture differences
  • Update CLAUDE.md with drupal_cms_helper export workflow
  • Update README.md with expanded module list and development section
  • Add healthcare-specific features and target audience description

Closes #3578112

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