Add a front matter option for meta images

Use relative path without leading slash
Open Graph does not support SVGs, use PNGs

Change-Id: I9e7f7e4f745132b7648ec01530436c533d0556a4

Author: harryyoud

_config.yml

@@ -40,7 +40,7 @@ google_analytics: UA-89627920-1
 
 # Your website URL (e.g. http://barryclark.github.io or http://www.barryclark.co)
 # Used for Sitemap.xml and your RSS feed
-url:
+url: https://lineageos.org
 
 # If you're hosting your site at a Project repository on GitHub pages
 # (http://yourusername.github.io/repository-name)

_includes/meta.html

@@ -15,4 +15,8 @@
     {% if page.title %}
     <meta property="og:title" content="{{ page.title }}" />
     <meta property="twitter:title" content="{{ page.title }}" />
-    {% endif %}
+    {% endif %}
+
+    {% if page.image %}
+    <meta property="og:image" content="{{ site.baseurl }}/{{ page.image }}" />
+    {% endif %}