Update nits in README.md (#397)

README.md

@@ -9,11 +9,11 @@ implementation status and how to run WebGPU in your browser at
 
 ## Building
 `webgpu-samples` is built with [Typescript](https://www.typescriptlang.org/)
-and compiled using [Next.js](https://nextjs.org/). Building the project
+and bundled using [Rollup](https://rollupjs.org/). Building the project
 requires an installation of [Node.js](https://nodejs.org/en/).
 
 - Install dependencies: `npm install`.
 - For development, start the dev server which will watch and recompile
-  sources: `npm start`. You can navigate to http://localhost:3000 to view the project.
+  sources: `npm start`. You can navigate to http://localhost:8080 to view the project.
 - For production, compile the project: `npm run build`.
 - To run a production server to serve the built assets, do `npm run serve`.