Fix build on recent Hugo versions (#58)

Author: progval

content/tools.md

@@ -1,7 +1,3 @@
----
-markup: mmark
----
-
 ### Tools
 
 This page lists some existing tools to help with CodeMeta files

themes/hugo-material/layouts/partials/head.html

@@ -3,7 +3,6 @@
 	<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
 	<meta content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0, shrink-to-fit=no' name='viewport' />
 
-  {{ .Hugo.Generator }}
   {{ with .Site.Params.name }}<meta name="author" content="{{ . }}">{{ end }}
   {{ with .Site.Params.role }}<meta name="description" content="{{ . }}">{{ end }}
 
@@ -30,7 +29,7 @@
   {{ range .Site.Params.custom_css }}
   <link rel="stylesheet" href="{{ "/css/" | relURL }}{{ . }}">
   {{ end }}
-  <link rel="feed" href="{{ .RSSLink | default .Site.RSSLink }}" type="application/rss+xml" title="{{ .Site.Title }}">
+  {{ with .OutputFormats.Get "RSS" }}{{ .RelPermalink }}{{ end }}
   <link rel="canonical" href="{{ .Permalink }}">
 
 </head>