Add open graph meta tags

Author: Janaka-Steph

ui/src/partials/head-meta.hbs

@@ -3,4 +3,4 @@
 <meta property="og:url" content="https://bitcoinjs-guide.bitcoin-studio.com"/>
 <meta property="og:title" content="Bitcoin Programming with BitcoinJS, Bitcoin Core and LND"/>
 <meta property="og:description" content="Learn Bitcoin programming, how to construct all kind of transactions and much more!"/>
-<meta property="og:image" content="../../_/img/bitcoin-studio-bridge.jpg"/>
+<meta property="og:image" content="https://bitcoinjs-guide.bitcoin-studio.com/_/img/bitcoin-studio-bridge.jpg"/>