docs: replace vuepress docs dir with vitepress docs dir

docs/src/.vitepress/theme/index.ts

@@ -0,0 +1,19 @@
+import type { Theme } from 'vitepress'
+import VueAnimXyz from '@animxyz/vue3'
+import DefaultTheme from 'vitepress/theme'
+import Layout from './layouts/default.vue'
+import 'virtual:windi.css'
+import '@animxyz/core'
+import '@braks/vue-flow/dist/style.css'
+import '@braks/vue-flow/dist/theme-default.css'
+import './../../assets/index.css'
+
+const CustomTheme = {
+  ...DefaultTheme,
+  Layout,
+  enhanceApp: ({ app }) => {
+    app.use(VueAnimXyz)
+  },
+} as Theme
+
+export default CustomTheme

docs/src/.vitepress/theme/layouts/default.vue

@@ -0,0 +1,15 @@
+<script setup>
+import DefaultTheme from 'vitepress/theme'
+
+const { Layout: ParentLayout } = DefaultTheme
+</script>
+
+<template>
+  <ParentLayout></ParentLayout>
+</template>
+
+<style>
+.page-footer {
+  @apply py-4 text-center;
+}
+</style>