adding cookbook url to 'go to cookbook'

themes/haystack/layouts/_default/blog-post.html

@@ -58,7 +58,7 @@
                     Run the Example
                   </a>
 
-                  <a href="https://github.com/deepset-ai/haystack-cookbook/tree/main" class="btn btn-dark-blue colab-btn" target="_blank" rel="noopener">
+                  <a href="/cookbook" class="btn btn-dark-blue colab-btn" target="_blank" rel="noopener">
                     <!-- <svg class="github-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" width="20" height="20">
                       <path
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