Replace aliases with Netlify's _redirects

See https://github.com/gohugoio/hugo/issues/3613
See https://github.com/gohugoio/hugo/issues/3614

config.toml

@@ -2,10 +2,27 @@ title = "Hugo: A Fast and Flexible Website Generator"
 baseurl = "http://gohugo.io/"
 MetaDataFormat = "yaml"
 pluralizeListTitles = false
+# We do redirects via Netlify's _redirects file, generated by Hugo (see "outputs" below).
+disableAliases = true
 
 [blackfriday]
   plainIDAnchors = true
 
+[outputs]
+home = [ "HTML", "RSS", "REDIR" ]
+
+[mediaTypes]
+[mediaTypes."text/netlify"]
+suffix = ""
+delimiter = ""
+
+[outputFormats]
+[outputFormats.REDIR]
+mediatype = "text/netlify"
+baseName = "_redirects"
+isPlainText = true
+notAlternative = true
+
 [params]
   description = "Documentation of Hugo, a fast and flexible static site generator built with love by spf13, bep and friends in Go"
   author = "Steve Francia (spf13) and friends"

layouts/index.redir

@@ -0,0 +1,6 @@
+# Netlify redirects. See https://www.netlify.com/docs/redirects/
+{{  range $p := .Site.Pages -}}
+{{ range .Aliases }}
+{{  . | printf "%-35s" }}	{{ $p.RelPermalink -}}
+{{ end -}}
+{{- end -}}