Needs to be updated to new version of Lerna and Cloudflare

[NicoPowers]

Which Cloudflare product does this pertain to?

Workers

Existing documentation URL(s)

https://developers.cloudflare.com/workers/tutorials/manage-projects-with-lerna/

What changes are you suggesting?

The introduction of Lerna V7 removed lerna bootstrap and the deprecation of wrangler init also needs to be updated to npm create cloudflare@latest

The introduction of pnpm instead of npm would be ideal to allow for more efficient sharing of node_modules

Additional information

It may be better to change the example of using handlers and APIs to something more relatable, like some kind of shared arithmetic functions or shared models / domains that need to be shared across two workers.