Dev Tools: fix landing page URL, blurbs; add Tx sender

tool/template-redirect.html

@@ -0,0 +1,14 @@
+{% extends "template-base.html" %}
+{% block head %}
+
+<meta http-equiv="refresh" content="0;url={{currentpage.redirect_url}}" />
+{% endblock %}
+
+
+{% block main %}
+  <article class="p-3">
+    <div class="content">
+        <p>This page has been moved! You should be redirected automatically. If not, <a href="{{currentpage.redirect_url}}">click here to go to the new {{currentpage.name}} page</a>.
+    </div>
+  </article>
+{% endblock %}