Update contributing

CONTRIBUTING.md

@@ -10,9 +10,8 @@ The Now 2.0 platform handles [routing](https://github.com/styfle/og-image/blob/m
 However, local development requires a few steps.
 
 1. Run `npm run watch` to get TS to JS compilation file watch running (compiles on save)
-2. Run the backend with `npm start` and visit http://localhost:13463/Boom.png
+2. Run the backend with `npm start` (you can try it by visiting http://localhost:13463/Nice.png)
 3. Run the frontend with `npx http-server .` and visit http://localhost:8080/public/index.html
-4. Edit `index.html` and change the path of the script from `browser.js` to `../dist/browser.js`
-5. Edit `browser.ts` and change the URL of `https://og-image.now.sh` to `http://localhost:13463`
+4. If necessary, edit the `exePath` in [options.ts](https://github.com/styfle/og-image/blob/master/src/options.ts) to point to your local Chrome executable
 
 Now you're ready to start local development!