update(docs): Add windicss

* remove unused files

docs/.vitepress/windi.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from 'windicss/helpers'
+import { resolve } from 'path'
+
+export default defineConfig({
+  extract: {
+    include: [
+      resolve(__dirname, 'components/**/*.{ts,md,vue}')
+    ],
+  },
+  attributify: true,
+})