feat: AnnotatedCode use github-light-high-contrast theme

Author: coseeian

src/components/AnnotatedCode/index.astro

@@ -52,7 +52,7 @@ const code = rows.map((row) => row.code).join('');
 // Convert it to HTML with style tags
 const html = await codeToHtml(code, {
   lang: props.lang || 'javascript',
-  theme: props.theme || 'github-light',
+  theme: props.theme || 'github-light-high-contrast',
 })
 
 // Turn it into a DOM tree we can query