feat: add logging and error handling

static/css/index.css

@@ -8,6 +8,7 @@
 
 #results td {
 	text-align: center;
+	vertical-align: middle;
 }
 
 #results_processing {

static/error.html

@@ -0,0 +1,16 @@
+<div class="container">
+	<div class="columns is-vcentered">
+		<div class="column has-text-centered">
+			<h1 class="title is-size-2">{{name}} ({{status}})</h1>
+			<p class="subtitle">{{description}}</p>
+			<p>
+				Request ID:
+				<code>{{reqId}}</code>
+			</p>
+
+			<br>
+			<a class="button is-info" href="/">Back to Armory</a>
+			<a class="button is-info">Homepage</a>
+		</div>
+	</div>
+</div>