feat: add links count

src/components/SideMenu/Categories/Categories.tsx

@@ -1,6 +1,7 @@
 import { Category } from "types";
 import CategoryItem from "./CategoryItem";
 
+import { useMemo } from "react";
 import styles from "./categories.module.scss";
 
 interface CategoriesProps {
@@ -13,9 +14,13 @@ export default function Categories({
   categoryActive,
   handleSelectCategory,
 }: CategoriesProps) {
+  const linksCount = useMemo(
+    () => categories.reduce((acc, current) => (acc += current.links.length), 0),
+    [categories]
+  );
   return (
     <div className={styles["categories"]}>
-      <h4>Catégories</h4>
+      <h4>Catégories • {linksCount}</h4>
       <ul className={styles["items"]}>
         {categories.map((category, key) => (
           <CategoryItem