WIP: initial setup with vite and vitepress, example with button

docs/.vitepress/theme/index.js

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+import './tailwind.css'
+
+import DefaultTheme from 'vitepress/theme'
+
+export default DefaultTheme

docs/.vitepress/theme/tailwind.css

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+