Move back to actual real ICOs for favicon

app.js

@@ -651,7 +651,7 @@ Promise.all([findCompilers(), aws.initConfig(awsProps)])
                 res.set('Content-Type', 'application/xml');
                 res.render('sitemap');
             })
-            .use(sFavicon(path.join(staticDir, webpackConfig.output.publicPath, 'favicon.png')));
+            .use(sFavicon(path.join(staticDir, webpackConfig.output.publicPath, 'favicon.ico')));
 
         webServer
             .use(bodyParser.json({limit: ceProps('bodyParserLimit', maxUploadSize)}))

views/head.pug

@@ -1,5 +1,5 @@
 title Compiler Explorer
-link(rel="icon" href="favicon.png")
+link(rel="icon" href="favicon.ico?v=1")
 meta(charset="utf-8")
 meta(http-equiv="X-UA-Compatible" content="IE=edge")
 meta(name="description" content="Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C, C++, Rust, Go, D, Haskell, Swift & Pascal code.")

webpack.config.js

@@ -35,7 +35,7 @@ let plugins = [
         to: vsPath,
     },
     {
-        from: path.join(staticPath, "favicon.png"),
+        from: path.join(staticPath, "favicon.ico"),
         to: distPath,
     },
     ]),