Remove slug filter

src/_config/markdown-it.js

@@ -14,18 +14,6 @@ import slugify from "slugify";
 export let markdownLibrary;
 
 export default function(eleventyConfig) {
-    // Configure slug filter
-    eleventyConfig.addFilter("slug", (str) => {
-        if (!str) {
-            return;
-        }
-
-        return slugify(str, {
-            lower: true,
-            remove: /["]/g,
-        });
-    });
-
     // Configure markdown-it-anchor plugins
     eleventyConfig.setLibrary('md', markdownIt().use(markdownItAnchor))
     const linkAfterHeader = markdownItAnchor.permalink.linkAfterHeader({