hello world, again

docs/.vitepress/theme/Layout.vue

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+<script setup lang="ts">
+import DefaultTheme from 'vitepress/theme'
+import { useData } from 'vitepress'
+import { nextTick, provide } from 'vue'
+import Sidebar from './components/SidebarCard.vue'
+import Announcement from './components/Announcement.vue'
+
+const { isDark } = useData()
+
+const enableTransitions = () =>
+  'startViewTransition' in document &&
+  window.matchMedia('(prefers-reduced-motion: no-preference)').matches
+
+provide('toggle-appearance', async ({ clientX: x, clientY: y }: MouseEvent) => {
+  if (!enableTransitions()) {
+    isDark.value = !isDark.value
+    return
+  }
+
+  const clipPath = [
+    `circle(0px at ${x}px ${y}px)`,
+    `circle(${Math.hypot(
+      Math.max(x, innerWidth - x),
+      Math.max(y, innerHeight - y)
+    )}px at ${x}px ${y}px)`
+  ]
+
+  // @ts-expect-error
+  await document.startViewTransition(async () => {
+    isDark.value = !isDark.value
+    await nextTick()
+  }).ready
+
+  document.documentElement.animate(
+    { clipPath: isDark.value ? clipPath.reverse() : clipPath },
+    {
+      duration: 300,
+      easing: 'ease-in',
+      pseudoElement: `::view-transition-${isDark.value ? 'old' : 'new'}(root)`
+    }
+  )
+})
+
+const { Layout } = DefaultTheme
+</script>
+
+<template>
+  <Layout>
+    <template #sidebar-nav-after>
+      <Sidebar />
+    </template>
+    <template #home-hero-prelink>
+      <Announcement />
+    </template>
+    <Content />
+  </Layout>
+</template>
+
+<style>
+::view-transition-old(root),
+::view-transition-new(root) {
+  animation: none;
+  mix-blend-mode: normal;
+}
+
+::view-transition-old(root),
+.dark::view-transition-new(root) {
+  z-index: 1;
+}
+
+::view-transition-new(root),
+.dark::view-transition-old(root) {
+  z-index: 9999;
+}
+
+.VPSwitchAppearance {
+  width: 22px !important;
+}
+
+.VPSwitchAppearance .check {
+  transform: none !important;
+}
+</style>