Jackson

Theme-ui's latest version includes a dependency from mdx-js/react which breaks Theme-ui due to mdx-js having migrated to ES Modules whereas Theme-ui is still using CommonJS. This can be fixed by...

Change Chapter1.md, and Sample1.rs to reflect the changes later made in Samples 2-5. It helps with debugging when following along manually. Also fat-finger typos in samples 2-5: 0x34 -> 0x3f...