chore: 更新谷歌广告ID并移除未使用的图片资源

- 将谷歌广告ID更新为新的发布商ID
- 删除public目录下不再使用的2loli.webp和xinghui.avif文件

public/ads.txt

@@ -1 +1 @@
-google.com, pub-1683686345039700, DIRECT, f08c47fec0942fa0
+google.com, pub-2618491437522884, DIRECT, f08c47fec0942fa0

src/layouts/Layout.astro

@@ -240,9 +240,9 @@ const bannerOffset =
 		<!-- Umami分析（自建） -->
 		<script defer src="https://umami.afo.im/script.js" data-website-id="4b4e430d-a12c-4a5c-8cf9-df48eb20fd6d"></script>
 		<!-- 谷歌广告 -->
-		<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1683686345039700"
+<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-2618491437522884"
      crossorigin="anonymous"></script>
-	 <meta name="google-adsense-account" content="ca-pub-1683686345039700">
+	 <meta name="google-adsense-account" content="ca-pub-2618491437522884">
 		<!-- 百度统计 -->
 <script>
 var _hmt = _hmt || [];