style: add LinkedIn link next to GitHub Profile button in home page hero

Author: networkandcode

src/pages/index.astro

@@ -104,6 +104,7 @@ const totalProjects = featuredProjects.length;
           Open Official CV (Google Doc) →
         </a>
         <a href="https://github.com/networkandcode" target="_blank" rel="noopener" class="btn btn-secondary">GitHub Profile &rarr;</a>
+        <a href="https://linkedin.com/in/networkandcode" target="_blank" rel="noopener" class="btn btn-secondary">LinkedIn &rarr;</a>
       </div>
     </div>
   </section>