404 page

src/404.md

@@ -0,0 +1,16 @@
+---
+layout: base
+permalink: /404.html
+---
+
+<article style="text-align:center;">
+    <header>
+        <h1>Somehow lost…</h1>
+    </header>
+
+    The page you are trying to access
+    does not exist. This is a 404-error
+    page.
+
+    [Go to the homepage](/)
+</article>