seo: add Instagram to Person sameAs and footer links

Author: tapiwamakandigona

index.html

@@ -73,6 +73,7 @@
         "sameAs": [
           "https://github.com/tapiwamakandigona",
           "https://www.linkedin.com/in/tapiwa-makandigona-2562473a0/",
+          "https://www.instagram.com/makandigonatapiwa/",
           "https://tapiwamakandigona.github.io/"
         ]
       },
@@ -332,6 +333,7 @@ <h2 class="section-label">About</h2>
     <span>Kwekwe, Zimbabwe 🇿🇼</span>
     <a href="mailto:silentics.org@gmail.com">silentics.org@gmail.com</a>
     <a href="https://www.linkedin.com/in/tapiwa-makandigona-2562473a0/" rel="me noopener" target="_blank">LinkedIn</a>
+    <a href="https://www.instagram.com/makandigonatapiwa/" rel="me noopener" target="_blank">Instagram</a>
   </footer>
 
   <button class="back-top" id="back-top" aria-label="Back to top">↑</button>