Replaced the cloudflare worker examples with an updated version

examples/cloudflare-worker/README.md

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+# Cloudflare Workers example (wrangler)
+
+This is a sample project for showing passkit-generator working on a Cloudflare Worker.
+
+Cloudflare Workers are serverless function based on Browser's V8 (instead of Node). For this reason Cloudflare workers are need to setup to support node compatibility (see wranger.toml).
+
+This example offers just the generation of a single static `boardingPass`.
+
+> Please note that creating and publishing a Cloudflare Workers with passkit-generator, might require you to buy a plan.
+> Cloudflare limits are pretty low.
+
+## Setting up
+
+Install all the dependencies through `npm install`.
+Configure wrangler and your account [according to the guide](https://developers.cloudflare.com/workers/get-started/guide).
+You are always suggested to start with a brand new project and to not clone this one, so that you won't miss any configuration you might need.
+
+### Secrets and certificates
+
+This example uses some environmental variables (secrets), which can be set through Wrangler CLI, through Dashboard or through `wrangler.toml`, as per [envs documentation](https://developers.cloudflare.com/workers/platform/environment-variables#adding-secrets-via-wrangler) and [secrets documentation](https://developers.cloudflare.com/workers/configuration/secrets/):
+
+-   `SIGNER_CERT`
+-   `SIGNER_KEY`
+-   `SIGNER_PASSPHRASE`
+-   `WWDR`
+
+So, assuming you have `certificates` folder in the root of passkit-generator and all the dependencies installed, you'll be able to directly inject your secrets into wrangler by doing this.
+
+```sh
+$ cat ../../../certificates/signerKey.pem | npx wrangler secret put SIGNER_KEY
+```
+
+These variables are exposed on `env` when performing the request.
+
+For the sake of the example, `signerCert`, `signerKey`, `signerKeyPassphrase` and `wwdr` are set to be distributed through `wrangler.toml`, but you should keep them safe in the secrets storage above.
+
+### Running locally
+
+Install dependencies via `npm install`. Then, to run the worker locally, run `npm run example`.
+
+### Example details
+
+Several details are described inside the `wrangler.toml` file. Give them a look.