feat: Add headers configuration for sitemap.xml in Vercel settings

Author: 0xdevcollins

vercel.json

@@ -7,5 +7,16 @@
     "npm_config_platform": "linux",
     "npm_config_arch": "x64",
     "npm_config_libc": "glibc"
-  }
+  },
+  "headers": [
+    {
+      "source": "/sitemap.xml",
+      "headers": [
+        {
+          "key": "Content-Encoding",
+          "value": "identity"
+        }
+      ]
+    }
+  ]
 }