add sitemap and robots

imprint.html

@@ -5,6 +5,8 @@
     <meta name="description" content="Imprint | Veit Heller—Technologist at Large">
     <meta name="author" content="Veit Heller">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="robots" content="noindex, follow">
+    <link rel="canonical" href="https://veitheller.de/imprint.html">
     <link rel="icon" href="data:;base64,iVBORw0KGgo=">
     <style>
       @font-face {