Use four column layout on graph page

Author: Kobzol

site/static/index.html

@@ -385,7 +385,7 @@ <h3>This may take a while!</h3>
 
                     let plotOpts = genPlotOpts({
                         title: benchName + "-" + benchKind,
-                        width: Math.floor(window.innerWidth / 3) - 16,
+                        width: Math.floor(window.innerWidth / 4) - 16,
                         height: 300,
                         yAxisLabel,
                         series: seriesOpts,