Update Googe Analytics code

index.html

@@ -4,13 +4,14 @@
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     <meta name="description" content="A high-performance toolkit for molecular simulation. Use it as a library, or as an application. We include extensive language bindings for Python, C, C++, and even Fortran. The code is open source and actively maintained on Github, licensed under MIT and LGPL.">
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-      gtag('config', 'G-HW60Z9TDXB');
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+      ga.l =+ new Date
+      ga('create', 'G-HW60Z9TDXB', 'auto')
+      ga('set', 'page', '/')
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+    <script async src='https://www.google-analytics.com/analytics.js'></script>
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