chore: add simple copyright

components/layout/SimpleCopyright.vue

@@ -0,0 +1,13 @@
+<template>
+  <div text="center sm" my-2>
+    <CurrentVersion />
+    <a
+      href="https://www.bilibili.com/opus/649847454294868008" target="_blank"
+      class="inline-flex items-center justify-center"
+    >
+      <span>Made</span>
+      <div i-ri-bilibili-line mx-1 class="text-pink-400" />
+      <span>云游君</span>
+    </a>
+  </div>
+</template>