Rename GitHub metrics to Metrics

source/app/web/statics/index.html

@@ -1,7 +1,7 @@
 <html>
   <head>
     <meta charset="utf-8">
-    <title>GitHub metrics</title>
+    <title>Metrics</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="description" content="A SVG image generator which includes activity, community and repositories metrics about your GitHub account that you can includes on your profile">
     <meta name="author" content="lowlighter">