move site-related headers/redirects out of netlify.toml

[skip ci]

layouts/index.headers

@@ -2,3 +2,8 @@
 # https://github.com/w3c/manifest/issues/689
 /site.webmanifest
   Content-Type: application/manifest+json
+
+# AMP cache invalidation key requirements:
+# https://developers.google.com/amp/cache/update-cache#update-cache-guidelines
+/.well-known/amphtml/apikey.pub
+  Content-Type: text/plain; charset=UTF-8

layouts/index.redirects

@@ -1,8 +1,21 @@
-# Prefer Netlify redirects over Hugo aliases
-# https://www.netlify.com/docs/redirects/
+/index.php*     /               301
+/feed           /feed.xml       301
+/rss            /feed.xml       301
+/index.xml      /feed.xml       301
 
-{{ range $p := .Site.Pages -}}
-{{- range .Aliases }}
-{{- . | printf "%-35s" }}    {{ $p.RelPermalink }}    301
+{{- with .Site.Params.social.webmentionIO }}
+/xmlrpc.php     https://webmention.io/{{ . }}/xmlrpc      302
 {{ end -}}
+
+/favicon.ico    /img/favicon.ico          200
+/favicon-*      /img/favicon-:splat       200
+/apple-touch-icon.png     /img/apple-touch-icon.png       200
+/apple-touch-icon-precomposed.png       /img/apple-touch-icon.png      200
+/safari-pinned-tab.svg    /img/safari-pinned-tab.svg      200
+
+# Hugo aliases: prefer HTTP 301 redirects over meta tags
+{{- range $page := .Site.Pages }}
+{{- range .Aliases }}
+{{ . }}    {{ $page.RelPermalink }}    301
+{{- end }}
 {{- end }}