Added a social image to the homepage

Author: matthew-carroll

source/images/branding/social.png

@@ -26,7 +26,7 @@ description: An inventory of shaders for Flutter developers to explore.
     <meta property="og:url" content="{{ homepage_url }}" />
     <meta property="og:title" content="{{ title }}" />
     <meta property="og:description" content="{{ description }}" />
-    <meta property="og:image" content="{{ homepage_url }}/images/social.png" />
+    <meta property="og:image" content="{{ homepage_url }}/images/branding/social.png" />
     <meta property="og:type" content="website" />
 
     <!-- Twitter -->
@@ -35,7 +35,7 @@ description: An inventory of shaders for Flutter developers to explore.
     <meta name="twitter:url" content="{{ homepage_url }}" />
     <meta name="twitter:title" content="{{ title }}" />
     <meta name="twitter:description" content="{{ description }}" />
-    <meta name="twitter:image" content="{{ homepage_url }}/images/social.png" />
+    <meta name="twitter:image" content="{{ homepage_url }}/images/branding/social.png" />
 
     <link href="/styles/tailwind.css" rel="stylesheet">