Use different pic for logos

Author: alvagante

_includes/head.html

@@ -41,8 +41,8 @@
   <meta property="og:title" content="{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}">
   <meta property="og:description" content="{% if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">
   <meta property="og:url" content="{{ page.url | prepend: site.url }}">
-  <meta property="og:image" content="{% if page.image %}{{ page.image | prepend: site.url }}{% else %}{{ site.url }}/img/logo.png{% endif %}">
+  <meta property="og:image" content="{% if page.image %}{{ page.image | prepend: site.url }}{% else %}{{ site.url }}/img/pic-logo.png{% endif %}">
   <meta name="twitter:card" content="summary_large_image">
   <meta name="twitter:title" content="{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}">
   <meta name="twitter:description" content="{% if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">
-  <meta name="twitter:image" content="{% if page.image %}{{ page.image | prepend: site.url }}{% else %}{{ site.url }}/img/logo.png{% endif %}">
+  <meta name="twitter:image" content="{% if page.image %}{{ page.image | prepend: site.url }}{% else %}{{ site.url }}/img/pic-logo.png{% endif %}">