Fixed doc reader bug

Replaced local js file with cnd one

docs/reader.html

@@ -11,7 +11,7 @@
 <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/tocas-ui/2.3.3/tocas.js"></script>
 
-<script src="showdown.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js"></script>
 <style>
 .specialpadding{
 	margin-top:0px !important;