Add Showdown v1.8.5

Markdown to HTML converter in Javascript

app/static/js/showdown-license.txt

+Showdown Copyright (c) 2007, John Fraser
+<http://www.attacklab.net/>
+All rights reserved.
+
+Original Markdown copyright (c) 2004, John Gruber
+<http://daringfireball.net/>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+* Neither the name "Markdown" nor the names of its contributors may
+  be used to endorse or promote products derived from this software
+  without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as
+is" and any express or implied warranties, including, but not limited
+to, the implied warranties of merchantability and fitness for a
+particular purpose are disclaimed. In no event shall the copyright owner
+or contributors be liable for any direct, indirect, incidental, special,
+exemplary, or consequential damages (including, but not limited to,
+procurement of substitute goods or services; loss of use, data, or
+profits; or business interruption) however caused and on any theory of
+liability, whether in contract, strict liability, or tort (including
+negligence or otherwise) arising in any way out of the use of this
+software, even if advised of the possibility of such damage.

app/templates/base.html

@@ -60,6 +60,7 @@
   <script src="{{ url_for('static', filename='js/jquery.dataTables.min.js') }}"></script>
   <script src="{{ url_for('static', filename='js/dataTables.bootstrap4.min.js') }}"></script>
   <script src="{{ url_for('static', filename='js/clipboard.min.js') }}"></script>
+  <script src="{{ url_for('static', filename='js/showdown.min.js') }}"></script>
   <script type=text/javascript>
     $SCRIPT_ROOT = {{ request.script_root|tojson|safe }};
   </script>