support podcasting 2.0 funding

layouts/_default/rss.xml

@@ -1,4 +1,4 @@
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:podcast="https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/1.0.md">
   <channel>
 	<title>{{.Title}}</title>
 	<link>{{ .Permalink }}</link>
@@ -8,7 +8,8 @@
 	<image>
     <url>{{.Site.BaseURL}}{{.Site.Params.default_img}}</url>
     </image>
-	<atom:link href="{{.Site.BaseURL}}/index.xml" rel="self" type="application/rss+xml" />{{ range .Site.RegularPages }}
+	<atom:link href="{{.Site.BaseURL}}/index.xml" rel="self" type="application/rss+xml" />{{ range .Site.RegularPages }}{{if .Site.Params.funding}}
+	<podcast:funding url="{{.Site.Params.funding}}">Support this work!</podcast:funding>{{end}}
 	<item>
 		<title>{{ .Title }}</title>
 		<link>{{ .Permalink }}</link>