introduce solid.js

src/ui/index.scss

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+@use "@picocss/pico/scss/pico";
+
+// Custom styling goes here

src/ui/index.tsx

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+import { render } from 'solid-js/web';
+import './index.scss';
+import App from './SolidHi';
+
+export function startApp() {
+  const root = document.getElementById('app');
+
+  if (root && !(root instanceof HTMLDivElement)) {
+    throw new Error('Root element not found');
+  }
+
+  render(() => (
+    <App />
+  ), root!);
+}