fix(docs): correct config examples format and structure

Author: jashtanna007

src/content/guides/getting-started.mdx

@@ -263,7 +263,7 @@ export default {
 };
 </CodeBlock>
 
-<CodeBlock label="webpack.config.cjs / .js">
+<CodeBlock label="webpack.config.cjs">
 const path = require('path');
 
 module.exports = {
@@ -275,9 +275,19 @@ module.exports = {
 };
 </CodeBlock>
 
-</CodeGroup>
+<CodeBlock label="webpack.config.js">
+const path = require('path');
 
+module.exports = {
+  entry: './src/index.js',
+  output: {
+    filename: 'main.js',
+    path: path.resolve(__dirname, 'dist'),
+  },
+};
+</CodeBlock>
 
+</CodeGroup>
 Now, let's run the build again but instead using our new configuration file:
 
 ```bash