Cloudflare template small changes + esbuild fix

[roelandxyz]

The Cloudflare template has a webpack.config.js file, but since esbuild is used that file can be removed.

In the README I would also change Vercel to Cloudflare :-)

[roelandxyz]

I would also add a parameter to the esbuild commands:
--main-fields=browser,module,main

Read more about this parameter here and here

I created an example

With that parameter you can use aws sdk 3

EDIT: added browser field after suggestion of @edmundhung

[machour]

Not applicable anymore I guess as the Cloudflare starters were rewritten.