Don't sluggify links

src/index.ts

@@ -166,7 +166,7 @@ export default function ofm() {
                 const alias = rawAlias?.slice(1).trim();
 
                 // internal link
-                const url = sluggify(fp + anchor)
+                const url = fp + anchor;
                 return {
                     type: "link",
                     url,