docs: Fix warnings after hugo upgrade to v0.55

docs/layouts/chrome/header.html

@@ -5,5 +5,5 @@
     <title>{{ .Title }}</title>
     <link rel="canonical" href="{{ .Permalink }}">
     {{ template "chrome/header.includes.html" . }}
-    {{ if .RSSLink }}<link href="{{ .RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />{{ end }}
+    {{ $RSSLink := "" }}{{ with .OutputFormats.Get "RSS" }}{{ $RSSLink = .RelPermalink }}{{ end }}{{ if $RSSLink }}<link href="{{ $RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />{{ end }}
 </head>

docs/layouts/section/commands.html

@@ -13,7 +13,7 @@
   <p>This is an index of all commands in rclone.</p>
   <ul>
     {{ range .Data.Pages }}
-    <li><a href="{{ .URL }}">{{ .Title }}</a></li>
+    <li><a href="{{ .RelPermalink }}">{{ .Title }}</a></li>
     {{ end }}
   </ul>
   <p>Docs autogenerated by <a href="https://github.com/spf13/cobra">Cobra</a>.</p>