fix: browser example ci

Author: vasco-santos

examples/libp2p-in-the-browser/index.html

@@ -16,7 +16,7 @@ <h1 id="status">Starting libp2p...</h1>
       <pre id="output"></pre>
     </main>
 
-    <script src="./index.js"></script>
+    <script type="module" src="./index.js"></script>
 
   </body>
 

examples/libp2p-in-the-browser/package.json

@@ -2,7 +2,6 @@
   "name": "libp2p-in-browser",
   "version": "1.0.0",
   "description": "A libp2p node running in the browser",
-  "main": "dist/index.html",
   "browserslist": [
     "last 2 Chrome versions"
   ],