style: link directly to external GitHub profile from homepage hero

Author: networkandcode

src/pages/index.astro

@@ -103,7 +103,7 @@ const totalProjects = featuredProjects.length;
         <a href={cvData.url} target="_blank" rel="noopener" class="btn btn-primary">
           Open Official CV (Google Doc) &rarr;
         </a>
-        <a href="/github" class="btn btn-secondary">GitHub Activity</a>
+        <a href="https://github.com/networkandcode" target="_blank" rel="noopener" class="btn btn-secondary">GitHub Profile &rarr;</a>
       </div>
     </div>
   </section>