Implement queue task deletion

templates/pages/queue_delete.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+
+{% block title %}del {{ short }}{% endblock %}
+
+{% block body %}
+
+<h2>Delete commit from queue</h2>
+
+<p>You are about to delete this commit from the queue:</p>
+<p>{{ commit|safe }}</p>
+<p>All runs of this commit currently in progress will be aborted!</p>
+
+<form method="post" action="{{ link_delete }}">
+    <input type="hidden" name="hash" value="{{ hash }}">
+    <button>Delete commit and abort runs</button>
+</form>
+
+{% endblock %}