Add implementation of additional meta fiels in head tag

Closes #28

themes/tsc_vfl/layouts/partials/page/head.html

@@ -2,6 +2,9 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta name="robots" content="{{ with .Params.robots }}{{ . }}{{ else }}index,follow{{ end }}">
+    <meta name="generator" content="Hugo static site generator">
+    {{ with .Params.description }}<meta name="description" content="{{ . }}">{{ end }}
+    {{ with .Keywords }}<meta name="keywords" content="{{ delimit . ",," ",," }}">{{ end }}
     {{ $options := (dict "targetPath" "main.css" "outputStyle" "compressed" "enableSourceMap" (not hugo.IsProduction)) }}
     {{ $scss := resources.Get "css/main.scss" | resources.ToCSS $options  }}
     <link rel="stylesheet" type="text/css" href="{{ $scss.RelPermalink }}">