Re: [w3c/browser-payment-api] WIP: move+rework examples (#553)

This is a work in progress (DON'T MERGE)... It also assumes #551 will land. 

It attempts to give more detailed examples of how to actually use the API. 

It still needs to be made more clear in the examples that the payment sheet is somewhat stateless. So if you call, `.updateWith()` and you don't re-provide *all the things*, then the whole thing changes. This was quite unexpected the first time I saw it - but makes sense - but will likely catch people out. 

Basically, developers need to build a state machine to track total, possible shipping options, and how that affects the total, etc. 


 

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