Add og_image override (#256)

Add an og_image field to an update to override the default og preview
image.

_includes/head.html

@@ -7,12 +7,20 @@
 
 <meta property="og:title" content="Tari" />
 <meta property="og:description" content="The protocol for digital assets" />
-<meta property="og:image" content="{{ site.url }}assets/img/meta-image.jpg" />
+{% if page.og_image %}
+    <meta property="og:image" content="{{ site.url }}{{ page.og_image }}" />
+{% else %}
+    <meta property="og:image" content="{{ site.url }}assets/img/meta-image.jpg" />
+{% endif %}
 <meta property="og:url" content="{{ site.url }}" />
 
 <meta name="twitter:title" content="Tari" />
 <meta name="twitter:description" content="The protocol for digital assets" />
-<meta name="twitter:image" content="{{ site.url }}assets/img/meta-image.jpg" />
+{% if page.og_image %}
+    <meta name="twitter:image" content="{{ site.url }}{{ page.og_image }}" />
+{% else %}
+    <meta name="twitter:image" content="{{ site.url }}assets/img/meta-image.jpg" />
+{% endif %}
 <meta name="twitter:card" content="summary_large_image" />
 <meta name="twitter:site" content="@tari" />
 

_updates/2024-10-14-update-135.md

@@ -6,6 +6,7 @@ author: solivagant
 thumbnail: update-background.jpg
 title: The Tari Constant
 class: subpage
+og_image: "/assets/updates/img/update-background.jpg"
 ---
 
 Welcome to the next Tari update. Tari Universe, much like its namesake, continues to expand at an astronomical rate, and we have you to thank for it. We’d like to share some stats regarding the known Universe: