docs: fix kestra link

Currently the showcase section of the homepage uses octai.com as the URL
for both Octai and Kestra's showcase sections. This PR just updates it
to use the correct URL.

docs/components/home/Showcase.vue

@@ -42,7 +42,7 @@
             </div>
 
             <div class="px-1">
-              <a href="https://octai.com" target="_blank">
+              <a href="https://kestra.io" target="_blank">
                 <h2 class="text-3xl mt-6 font-semibold inline-block">Kestra</h2>
               </a>