Added atom meta link

Signed-off-by: Blagovest Petrov <blagovest@petrovs.info>

layouts/partials/head.html

@@ -7,6 +7,7 @@
     <meta name="theme-color" content="#000084" />
     <link rel="icon" href="{{ .Site.BaseURL }}/favicon.ico">
     <link rel="canonical" href="{{ .Site.BaseURL }}">
+    <link rel="alternate" type="application/atom+xml" title="Atom 2.0" href="https://petrovs.info/index.xml">
     {{/* Don't ask why it's like this. This original theme is a mess... */}}
     <!-- <noscript><style>body { visibility: visible }</style></noscript> -->
 </head>