DEV: Don't strip numbers in headings

common/header.html

@@ -22,7 +22,7 @@
       .trim()
       .toLowerCase()
       .replace(
-        /[\{\}\[\]\\\/\<\>\(\)\|\+\?\*\^\'\`\'\"\.\_\$\d\s~!@#%&,;:=]/gi,
+        /[\{\}\[\]\\\/\<\>\(\)\|\+\?\*\^\'\`\'\"\.\_\$\s~!@#%&,;:=]/gi,
         "-"
       )
       .replace(/\-\-+/g, "-")
@@ -386,4 +386,4 @@
       }
     });
   }
-</script>
+</script>