Port the web to bootstrap5

So it is responsive in phones.

templates/news.html

@@ -1,15 +1,16 @@
 {{template "header.html" .S}}
 
-<h4>News:
-	<a href="/news/?fmt=rss" class="pull-right"><img src="/img/feed.png"/></a>
-</h4>
-
-<dl class="dl-horizontal">
-{{range .News}}
-<div class="well well-small">
-    <dt>{{.Date}}</dt>
-    <dd>{{.Text}}</dd>
+<div class="row">
+  <h4 class="col">News:</h4>
+  <a href="/news/?fmt=rss" class="col text-end"><img src="/img/feed.png"/></a>
 </div>
+
+<dl>
+{{range .News}}
+  <div class="row">
+    <dt class="col-sm-2 text-sm-end">{{.Date}}</dt>
+    <dd class="col-sm-10">{{.Text}}</dd>
+  </div>
 {{end}}
 </dl>