In rss.pug fixed link tag. Jade treats it like an HTML's link self-closing tag.

web/templates/rss.pug

@@ -6,7 +6,7 @@ rss(version='2.0')
         title Arav's dwelling
         description Updates on my websites and infrastructure.
         language en-gb
-        link= host
+        | <link>#{host}</link>
 
         each post in posts
             item
@@ -14,7 +14,7 @@ rss(version='2.0')
                 category= post.Category.Name
                 guid!= `${post.PostID()}`
                 pubDate= util.ToClientTimezone(post.Date, r).Format("20060102-150405")
-                link!= `${host}/mindflow#${post.PostID()}`
+                | <link>#{host}/mindflow##{post.PostID()}</link>
                 author!= author
                 description
                     | <![CDATA[