feat: optimize rss output format and add rss ignored support (#8)

* feat: optimize rss output format and add rss ignored support

I optimized the rss format accoring to hugo best practice and add "rss_ignore" prarm to manually
ignore some pages to to fetched by rss readers

* fix: change some settings to keep original features and make it backward-compatible

* revert: reverted to orginal version to keep the icon

* fix: keep both webfeeds and content in rss settings

layouts/rss.xml

@@ -11,7 +11,7 @@
 {{- $pages = $pages | first $limit -}}
 {{- end -}}
 {{- printf "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>" | safeHTML }}
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:webfeeds="http://webfeeds.org/rss/1.0">
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:webfeeds="http://webfeeds.org/rss/1.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
   <channel>
     <title>{{ if eq  .Title  .Site.Title }}{{ .Site.Title }}{{ else }}{{ with .Title }}{{.}} on {{ end }}{{ .Site.Title }}{{ end }}</title>
     <link>{{ .Permalink }}</link>
@@ -28,19 +28,18 @@
     {{ with .OutputFormats.Get "RSS" }}
     {{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
     {{ end }}
-    {{ range $pages }}
+    {{ range $pages }}{{ if ne .Params.rss_ignore true }}
     <item>
       <title>{{ .Title }}</title>
       <link>{{ .Permalink }}</link>
       <pubDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</pubDate>
       {{ with .Site.Author.email }}<author>{{.}}{{ with $.Site.Author.name }} ({{.}}){{end}}</author>{{end}}
       <guid>{{ .Permalink }}</guid>
-      {{ if .Site.Params.rssFullContent }}
-        <description>{{ .Content | html }}</description>
-      {{ else }}
-        <description>{{ .Summary | html }}</description>
-      {{ end }}
+      <description>{{ with .Description | html }}{{ . }}{{ else }}{{ .Summary | html }}{{ end -}}</description>
+      {{- if .Site.Params.rssFullContent}}
+      <content:encoded>{{ (printf "<![CDATA[%s]]>" .Content) | safeHTML }}</content:encoded>
+      {{- end }}
     </item>
-    {{ end }}
+    {{ end }}{{ end }}
   </channel>
-</rss>
+</rss>