fix: update broken links

Author: ErwanDecoster

src/get-started/helloWorld/3-buildIApp.md

@@ -342,11 +342,11 @@ Deploy your iApp on the iExec protocol.
 <div class="flex flex-col gap-2.5 my-6">
   <div class="flex items-center gap-3">
     <span class="bg-gray-950 text-sm text-white w-6 h-6 rounded-full flex items-center justify-center font-medium">1</span>
-    <span>Go to [Docker Hub Security Settings](https://hub.docker.com/settings/security)</span>
+    <span>Go to <a href="https://hub.docker.com/settings/security" target="_blank">Docker Hub Security Settings</a></span>
   </div>
   <div class="flex items-center gap-3">
     <span class="bg-gray-950 text-sm text-white w-6 h-6 rounded-full flex items-center justify-center font-medium">2</span>
-    <span>Click ["Personal access tokens"](https://app.docker.com/settings/personal-access-tokens) → "Generate new token"</span>
+    <span>Click [<a href="https://app.docker.com/settings/personal-access-tokens" target="_blank">"Personal access tokens"</a> → "Generate new token"</span>
   </div>
   <div class="flex items-center gap-3">
     <span class="bg-gray-950 text-sm text-white w-6 h-6 rounded-full flex items-center justify-center font-medium">3</span>

src/get-started/helloWorld/5-bonusChapter.md

@@ -26,7 +26,7 @@ data, deploy iApp, and manage data access. Now it's time to claim your rewards!
     If you have any questions, please schedule an appointment with our DevRel team who will be happy to help!
     <br>
     <br>
-    [📅 Book a meeting](https://calendly.com/martin-leclercq-iexec/30min)
+    <a href="https://calendly.com/martin-leclercq-iexec/30min" target="_blank">📅 Book a meeting</a>
   </p>
   <div class="flex-1 flex justify-center">
     <img src="https://media0.giphy.com/media/v1.Y2lkPTc5MGI3NjExenE3ZW42enUydnl5b2F3ZDcyNHZkdXF6bzFydjl6bmc4MzYydHRweSZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/g9582DNuQppxC/giphy.gif" alt="Funny waiting animation" width="300" height="300" />