Add link rel canonical.

Author: XhmikosR

source/_includes/header.html

@@ -10,9 +10,11 @@
         {% capture meta_description %}{% if page.description %}{{ page.description }}{% if paginator.page and paginator.page != 1 %} - Page {{ paginator.page }}{% endif%}{% elsif page.excerpt %}{{ page.excerpt | newline_to_br | replace: '<br />', ' ' | strip_html | strip_newlines | replace: '  ', ' ' | rstrip | truncate: 155 }}{% else %}{{ site.description }}{% endif %}{% endcapture %}
         <meta name="description" content="{{ meta_description }}">
         <meta name="generator" content="Jekyll v{{ jekyll.version }}">
+        <meta name="generator" content="Jekyll v{{ jekyll.version }}">
 
         <link rel="stylesheet" href="/assets/css/pack.css">
 
+        <link rel="canonical" href="{{ site.url }}{{ page.url }}">
         <link rel="apple-touch-icon" href="/assets/img/favicons/apple-touch-icon.png" sizes="180x180">
         <link rel="icon" href="/assets/img/favicons/favicon-32x32.png" sizes="32x32" type="image/png">
         <link rel="icon" href="/assets/img/favicons/favicon-16x16.png" sizes="16x16" type="image/png">
@@ -27,11 +29,7 @@
         <meta property="og:title" content="{{ title }}">
         <meta property="og:type" content="website">
         <meta property="og:description" content="{{ meta_description }}">
-        {% if page.slug == "home" %}
-        <meta property="og:url" content="{{ site.url }}/">
-        {% else %}
         <meta property="og:url" content="{{ site.url }}{{ page.url }}">
-        {% endif %}
         <meta property="og:image" content="{{ site.url | replace: 'https://', 'http://' }}/assets/img/logo-256x256.png">
         <meta property="og:image:secure_url" content="{{ site.url }}/assets/img/logo-256x256.png">
         <meta property="og:image:type" content="image/png">