change doc icon

index.html

@@ -131,7 +131,7 @@ <h1 class="title is-1 publication-title is-bold">
                 <a href="https://opensv.readthedocs.io/en/latest/"
                    class="external-link button is-normal is-rounded is-dark">
                   <span class="icon">
-                      <i class="fa-readme"></i>
+                      <i class="fas fa-file"></i>
                   </span>
                   <span>Documentation</span>
                   </a>