add motd editor and motd display

app/templates/mod/panel.html

@@ -0,0 +1,23 @@
+{%- from 'common/macros.html' import subheader, babycode_editor_component -%}
+{%- extends 'base.html' -%}
+{%- block title -%}settings{%- endblock -%}
+{%- block content -%}
+{{- subheader('Moderation panel') -}}
+<fieldset class="plank">
+  <legend>Message of the Day</legend>
+  <p>The Message of the Day is shown on the front page and on each topic's thread list.</p>
+  <form class="full-width" method="POST" action="{{url_for('mod.set_motd')}}" id="motd-form">
+    <label for="motd-title">Title</label>
+    <input type="text" id="motd-title" name="motd_title" autocomplete="off" value="{{motd.title}}" required>
+    <label for="motd-content">Body</label>
+    {{ babycode_editor_component(placeholder='MOTD content', prefill=motd.body_original_markup, id='motd-content', banned_tags=MOTD_BANNED_TAGS) }}
+  </form>
+  <input type="submit" value="Save MOTD" form="motd-form">
+  <form method="POST" action="{{url_for('mod.clear_motd')}}">
+    <input type="submit" value="Clear MOTD" class="warn">
+  </form>
+</fieldset>
+<fieldset class="plank" id="sort-topics">
+  <legend>Sort topics</legend>
+</fieldset>
+{%- endblock -%}