chore: rename the main bundle to main.js (#270)

layouts/partials/head/others.html

@@ -1,4 +1,4 @@
-<script src="{{ index (index .Site.Data.assets "bundle.js") "src" | relURL }}"></script>
+<script src="{{ index (index .Site.Data.assets "main.js") "src" | relURL }}"></script>
 
 <link
   rel="preload"

webpack.config.js

@@ -16,7 +16,7 @@ var config = {
       path.resolve("src", "sass", "mobile.scss"),
       path.resolve("src", "sass", "print.scss")
     ],
-    bundle: path.resolve("src", "js", "app.js"),
+    main: path.resolve("src", "js", "app.js"),
     mermaid: path.resolve("src", "js", "mermaid.js"),
     katex: [path.resolve("src", "js", "katex.js")].concat(
       glob.sync(path.join(nodeModulesPath, "katex", "dist", "fonts", "*.{woff,woff2}"))