feat(chritsmas): create challenge for christmas

docs/src/content/docs/challenges/angular/39-injection-token.md

@@ -6,7 +6,6 @@ challengeNumber: 39
 command: angular-injection-token
 sidebar:
   order: 118
-  badge: New
 ---
 
 ## Information

docs/src/content/docs/challenges/performance/40-christmas-web-worker.md

@@ -0,0 +1,20 @@
+---
+title: 🟠 Web workers
+description: Challenge 40 is about ...
+author: Thomas Laforge
+challengeNumber: 40
+command: performance-christmas-web-worker
+sidebar:
+  order: 119
+  badge: New
+---
+
+:::note
+WIP: The following documentation need to be written.
+:::
+
+## Information
+
+## Statement
+
+## Constraints

docs/src/content/docs/index.mdx

@@ -15,7 +15,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: Go to the latest Challenge
-      link: /challenges/angular/39-injection-token/
+      link: /challenges/performance/40-christmas-web-worker/
       icon: rocket
     - text: Give a star
       link: https://github.com/tomalaforge/angular-challenges
@@ -27,8 +27,8 @@ import { Card, CardGrid } from '@astrojs/starlight/components';
 import MyIcon from '../../components/MyIcon.astro';
 
 <CardGrid>
-<Card title="39 Challenges">
-    This repository gathers 39 Challenges related to <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> and <b>Typescript</b>. 
+<Card title="40 Challenges">
+    This repository gathers 40 Challenges related to <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> and <b>Typescript</b>. 
     These challenges resolve around real-life issues or specific features to elevate your skills.
 </Card>