add wide preview for linkedin

dist/index.html

@@ -9,7 +9,7 @@
   <meta property="og:title" content="three.cad" />
   <meta property="og:description" content="CAD in the browser" />
   <meta property="og:url" content="https://twpride.github.io/three.cad/" />
-  <meta property="og:image" content="https://raw.githubusercontent.com/twpride/three.cad/gh-pages/sculpt.gif" />
+  <meta property="og:image" content="sculpt_wide.gif" />
   <link rel="apple-touch-icon" href="icon-192.png" />
   <link rel="manifest" href="manifest.json" />
   <link rel="stylesheet" href="app.css">