Add markdown utils

- External links open in a new tab
- Clicking on image open an image modal

templates/base.html

@@ -297,6 +297,7 @@
         {% include "extra_js.html" %}
         <script src="{{ static('common.js') }}"></script>
         <script src="{{ static('libs/clipboard/tooltip.js') }}"></script>
+        <script type="text/javascript" src="{{ static('libs/featherlight/featherlight.min.js') }}"></script>
         <script>
           moment.locale('{{ LANGUAGE_CODE }}');
           $(function () {