add large image for opengraph

Author: sunshowers

theme/head.hbs

@@ -1,6 +1,8 @@
-<meta name="twitter:card" content="summary" />
+<meta name="twitter:card" content="summary_large_image" />
 <meta name="twitter:site" content="@sunshowers6" />
 <meta name="twitter:creator" content="@sunshowers6" />
 <meta property="og:title" content="{{title}}" />
 <meta property="og:url" content="https://rust-cli-recommendations.sunshowers.io/{{path}}" />
+<meta property="og:image"
+    content="https://user-images.githubusercontent.com/180618/150586671-ba5e7a8a-0a0a-49f7-b560-55beec8ec4e6.png" />
 <meta property="og:description" content="{{description}}" />