chore: update readme instructions (#2017)

Author: daibhin

packages/browser/README.md

@@ -57,14 +57,13 @@ After all this, you'll be able to run through the below steps:
 
 ### Running local create react app example
 
-You can use the create react app setup in `playground/nextjs` to test posthog-js as an npm module in a Nextjs application.
+You can use the create react app setup in `packages/browser/playground/nextjs` to test posthog-js as an npm module in a Nextjs application.
 
 1. Run `posthog` locally on port 8000 (`DEBUG=1 TEST=1 ./bin/start`).
 1. Run `python manage.py setup_dev --no-data` on posthog repo, which sets up a demo account.
 1. Copy Project API key found in `http://localhost:8000/project/settings` and save it for the last step.
-1. Run `cd playground/nextjs`.
-1. Run `pnpm i` to install dependencies.
-1. Run `pnpm run build-posthog-js` to build `posthog-js` locally.
+1. Run `cd packages/browser/playground/nextjs`.
+1. Run `pnpm install-deps` to install dependencies.
 1. Run `NEXT_PUBLIC_POSTHOG_KEY='<your-local-api-key>' NEXT_PUBLIC_POSTHOG_HOST='http://localhost:8000' pnpm dev` to start the application.
 
 ### Tiers of testing