add missing core pieces from default slidev deploy

Author: jerdog

components/Counter.vue

@@ -0,0 +1,37 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+
+const props = defineProps({
+  count: {
+    default: 0,
+  },
+})
+
+const counter = ref(props.count)
+</script>
+
+<template>
+  <div flex="~" w="min" border="~ main rounded-md">
+    <button
+      border="r main"
+      p="2"
+      font="mono"
+      outline="!none"
+      hover:bg="gray-400 opacity-20"
+      @click="counter -= 1"
+    >
+      -
+    </button>
+    <span m="auto" p="2">{{ counter }}</span>
+    <button
+      border="l main"
+      p="2"
+      font="mono"
+      outline="!none"
+      hover:bg="gray-400 opacity-20"
+      @click="counter += 1"
+    >
+      +
+    </button>
+  </div>
+</template>