Update markdown languages in nuxt.config.ts to include XML

Author: TheMeinerLP

nuxt.config.ts

@@ -136,7 +136,7 @@ export default defineNuxtConfig({
     build: {
       markdown: {
         highlight: {
-          langs: ['json', 'java', 'js', 'ts', 'html', 'css', 'vue', 'shell', 'mdc', 'md', 'yaml'],
+          langs: ['json', 'java', 'xml', 'js', 'ts', 'html', 'css', 'vue', 'shell', 'mdc', 'md', 'yaml'],
           theme: {
             // Default theme (same as single string)
             default: 'github-light',