chore: Update donation link in navigation bar

docs/index.html

@@ -92,7 +92,7 @@
             </div>
             <a class="item" href="./document/">Document</a>
             <a class="item" href="https://github.com/zhw2590582/ArtPlayer">Github</a>
-            <a class="item" href="./donate.html">☕ 捐助</a>
+            <a class="item" href="./sponsor.html">☕ 捐助</a>
             <span class="item" href="#">Q群: 320881312</span>
         </div>
         <div class="tool">