Add asthma example variables and fix schema/test issues - #3

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: JamesIves/github-pages-deploy-action@6c2d9db40f9296374acc17b90404b6e8864128c8, marocchino/sticky-pull-request-comment@67d0dec7b07ed060a405f9b2a64b8ab319fdd7db. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/