Fix usage of level in the options object for markdown-it-anchor

.eleventy.js

@@ -73,9 +73,9 @@ module.exports = function(eleventyConfig) {
     permalink: markdownItAnchor.permalink.ariaHidden({
       placement: "after",
       class: "direct-link",
-      symbol: "#",
-      level: [1,2,3,4],
+      symbol: "#"
     }),
+    level: [1,2,3,4],
     slugify: eleventyConfig.getFilter("slug")
   });
   eleventyConfig.setLibrary("md", markdownLibrary);