Fix link

Author: mattcone

_layouts/about.html

@@ -19,7 +19,7 @@ <h1 class="no-anchor" data-toc-skip>{{ page.title }}</h1>
           <div class="card" style="margin-top: 30px">
             <h6 class="card-header no-anchor" data-toc-skip>Stay Informed</h6>
             <div class="card-body">
-              <p class="card-text" style="font-size: 15px; font-weight: 400"><a href="https://mailchi.mp/83d1d4363848/signup">Subscribe via email</a> to get priority notifications about the <em>Markdown Guide</em>.</p>
+              <p class="card-text" style="font-size: 15px; font-weight: 400"><a href="https://pika.forklabs.com/subscription/form">Subscribe via email</a> to get priority notifications about the <em>Markdown Guide</em>.</p>
             </div>
           </div>
         </div>