Added legacy lib-js

Author: Perki

index.html

@@ -14,7 +14,7 @@
             src="https://code.jquery.com/jquery-3.3.1.min.js"
             integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
             crossorigin="anonymous"></script>
-            <script type="text/javascript" src="https://pryv.github.io/lib-js/pryv.js"></script>
+            <script type="text/javascript" src="pryv.js"></script>
 </head>
 <style type="text/css">
     html, body {