Update readme.

README.md

@@ -3,20 +3,18 @@ Quantinuum design tokens and React components.
 
 Based on [shadcn](https://ui.shadcn.com/), an opinionated tailwind / radix-ui theme. Shadcn isn't a direct dependency but has a CLI tool to generate components into this repo based on `components.json`.
 
-Run storybook
+### Development
+
 ```bash
-npm run dev
-```
+npm run dev # Run storybook application to view components.
+npm run build-storybook # Build storybook application as static HTML.
+npm run build-lib # Build component library with rollup
+``` 
+
+### Design Tokens
+CSS variables declared in `src/tokens.css`. Dark mode is toggled by the presence of the class `.data-theme-dark` somewhere higher in the DOM tree.
 
-Run jest unit tests
-```
-npm run test
-```
 
-Build library with rollup
-```bash
-npm run build
-```