add meta tag (and robots)

Signed-off-by: Sam Therapy <sam@samtherapy.net>

src/_includes/layouts/main.tsx

@@ -10,6 +10,7 @@ export default (data: PageData) => (
       <title>{data.site.endpoint} Nameserver</title>
       <meta charSet="utf-8" />
       <meta name="viewport" content="width=device-width" />
+      <meta name="description" content="Landing page for the froth.zone nameserver service" />
       <Favicon char={data.body as string} />
       {/* @ts-ignore */}
       <link rel="stylesheet" href="../styles.css" inline />

src/robots.txt.njk

@@ -0,0 +1,2 @@
+User-Agent: *
+Disallow: