Update Open Graph and Twitter metadata to prepend site.url instead of site.baseurl.

Author: smelamud

_includes/preamble.html

@@ -22,7 +22,7 @@
     <meta property="og:title" content="{{ page.og_title }}">
 {% endif %}
 {% if page.og_image %}
-    <meta property="og:image" content="{{ page.og_image | prepend: site.baseurl }}">
+    <meta property="og:image" content="{{ page.og_image | prepend: site.url }}">
 {% endif %}
 {% if page.og_image_type %}
     <meta property="og:image:type" content="{{ page.og_image_type }}">
@@ -49,7 +49,7 @@
     <meta name="twitter:description" content="{{ page.og_description }}">
 {% endif %}
 {% if page.og_image %}
-    <meta name="twitter:image" content="{{ page.og_image | prepend: site.baseurl }}">
+    <meta name="twitter:image" content="{{ page.og_image | prepend: site.url }}">
 {% endif %}
 
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