docs(pages): 恢复 Chrome 对 Manifest V2 的支持

1. docs(pages): 恢复 Chrome 对 Manifest V2 的支持
2. style(pages): 文本美化
3. feat(config):  target="_blank" 插件：rehype-external-links
4. style(music): 增加一个音乐：准备出发

astro.config.mjs

@@ -23,6 +23,7 @@ import { parseDirectiveNode } from "./src/plugins/remark-directive-rehype.js";
 import { remarkExcerpt } from "./src/plugins/remark-excerpt.js";
 import { remarkReadingTime } from "./src/plugins/remark-reading-time.mjs";
 import { pluginCustomCopyButton } from "./src/plugins/expressive-code/custom-copy-button.js";
+import rehypeExternalLinks from 'rehype-external-links';
 
 // https://astro.build/config
 export default defineConfig({
@@ -128,6 +129,12 @@ export default defineConfig({
 					},
 				},
 			],
+			[
+				rehypeExternalLinks,
+				{
+				target: '_blank',
+				},
+			],
 			[
 				rehypeAutolinkHeadings,
 				{