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 () {

templates/comments/media-js.html

@@ -1,4 +1,3 @@
-<script src="{{ static('libs/featherlight/featherlight.min.js') }}" type="text/javascript"></script>
 {% compress js %}
   {{ comment_form.media.js }}
   <script type="text/javascript">

templates/contest/list.html

@@ -32,7 +32,6 @@
 {% endblock %}
 
 {% block three_col_js %}
-  <script src="{{ static('libs/featherlight/featherlight.min.js') }}" type="text/javascript"></script>
   <script type="text/javascript">
     function changeTabParameter(newTab) {
       const url = new URL(window.location);

templates/contest/ranking-css.html

@@ -42,7 +42,6 @@
   }
 
   .featherlight-content {
-    border-radius: 10px;
     height: 80%;
     width:  60%;
     overflow: auto;

templates/problem/data.html

@@ -6,7 +6,6 @@
     window.big_input = (window.valid_files.length > 100);
   </script>
   <script type="text/javascript" src="{{ static('jquery-ui.min.js') }}"></script>
-  <script type="text/javascript" src="{{ static('libs/featherlight/featherlight.min.js') }}"></script>
   <script type="text/javascript" src="{{ static('fine-uploader/jquery.fine-uploader.js') }}"></script>
   <script type="text/javascript">
     $(function () {

templates/problem/submission-diff.html

@@ -12,7 +12,6 @@
       });
     });
   </script>
-  <script type="text/javascript" src="{{ static('libs/featherlight/featherlight.min.js') }}"></script>
   <script type="text/javascript">
   </script>
 {% endblock %}

templates/ticket/ticket.html

@@ -5,7 +5,6 @@
 
 {% block js_media %}
   {{ form.media.js }}
-  <script src="{{ static('libs/featherlight/featherlight.min.js') }}" type="text/javascript"></script>
   <script type="text/javascript" src="{{ static('event.js') }}"></script>
   <script type="text/javascript">
     $(function () {

templates/timezone/media-js.html

@@ -1,5 +1,4 @@
 {% compress js %}
-  <script src="{{ static('libs/featherlight/featherlight.min.js') }}" type="text/javascript"></script>
   <script type="text/javascript" src="{{ static('libs/timezone-map/timezone-picker.js') }}"></script>
   <script type="text/javascript">
     $(function () {