Use docs.vavr.io (#14)

Author: pivovarit

index.html

@@ -99,7 +99,7 @@
                     </li>
                     -->
                     <li>
-                        <a class="page-scroll" href="//vavr-io.github.io/vavr-docs/">Documentation</a>
+                        <a class="page-scroll" href="//docs.vavr.io">Docs</a>
                     </li>
                     <li>
                         <a class="page-scroll" href="#downloads">Downloads</a>