Re: [w3c/webpayments-payment-apps-api] Payment app identifier to manifest filename mapping (#48)

I was under the impression that the group [prefers](https://github.com/w3c/webpayments-method-identifiers/issues/19) [HTTP Link headers](https://www.w3.org/wiki/LinkHeader) to map identifiers to useful things. For example:
```
$ curl --head https://bobpay.com | grep Link
Link: <payment-manifest.json>; rel="payment-method-manifest"
```
[ServiceWorker](https://w3c.github.io/ServiceWorker/#link-element-processing) can be installed this way as well:
```
$ curl --head https://alicepay.com | grep Link
Link: </js/sw.js>; rel="serviceworker"; scope="/"
```

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