[w3c/webpayments-payment-handler] Improve payment app arch image (#140)

* revised arch image
* updated caption for image
* minor tweak to intro language
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-payment-handler/pull/140

-- Commit Summary --

  * * Revised arch image
  * tidy

-- File Changes --

    M app-arch.png (0)
    M index.html (14)

-- Patch Links --

https://github.com/w3c/webpayments-payment-handler/pull/140.patch
https://github.com/w3c/webpayments-payment-handler/pull/140.diff

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