Fix link to Opal website

app/main/views/main/index.html

@@ -26,7 +26,7 @@ <h1>Volt is a framework for building<br /> data rich web applications<br />shock
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         <h2>Make the most of your time.</h2>
-        <p>Volt is a reactive web framework where your Ruby code runs both on the server and the client (via <a href='http://opalrb.org/' target='_blank'>opal</a>). The DOM automatically updates as the user interacts with the page, intelligently updating only the nodes that need to be changed. Data can easily be stored on the page, in a cookie, or in a database.  Take a look at the demo below, or jump into <a href='/getting_started'>getting started</a>.</p>
+        <p>Volt is a reactive web framework where your Ruby code runs both on the server and the client (via <a href='http://opalrb.com/' target='_blank'>opal</a>). The DOM automatically updates as the user interacts with the page, intelligently updating only the nodes that need to be changed. Data can easily be stored on the page, in a cookie, or in a database.  Take a look at the demo below, or jump into <a href='/getting_started'>getting started</a>.</p>
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