refactor: utilise feed_tag() helper

- https://hexo.io/docs/helpers#feed-tag

_config.yml

@@ -104,9 +104,5 @@ theme_config:
     Eepsite: http://mdleom.i2p
     'Eepsite (B32)': http://ggucqf2jmtfxcw7us5sts3x7u2qljseocfzlhzebfpihkyvhcqfa.b32.i2p
 
-  # Your Feed Location
-  # https://github.com/hexojs/hexo-generator-feed
-  rss: /atom.xml
-
   # Load forkawesome icons? See the links option below.
   icons: false

themes/chameleon/layout/_partial/head.ejs

@@ -26,8 +26,10 @@
   <%/* Add Open Graph meta tags for easier sharing on social networking sites */%>
   <%/* Modified from original source for compatibility with my blog */%>
   <%- openGraph() %>
-  <% if (theme.rss) { %>
-    <link rel="alternate" href="<%- theme.rss %>" title="<%= config.title %>" type="application/atom+xml">
+  <% if (config.feed) { %>
+    <%- feed_tag() %>
+  <% } else if (theme.rss) { %>
+    <%- feed_tag(theme.rss) %>
   <% } %>
   <%/* Favicon */%>
   <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png?v=yyQLrgrMjG">