[w3c/payment-method-id] Remove "standardized payment method identifiers" (#67)

With "basic-card" gone, we don't need standardized payment method identifiers anymore.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/payment-method-id/pull/67.html" title="Last updated on Aug 27, 2021, 8:20 AM UTC (8956ed6)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-method-id/67/a64adea...8956ed6.html" title="Last updated on Aug 27, 2021, 8:20 AM UTC (8956ed6)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-method-id/pull/67

-- Commit Summary --

  * Remove "standardized payment method identifiers"

-- File Changes --

    M index.html (130)

-- Patch Links --

https://github.com/w3c/payment-method-id/pull/67.patch
https://github.com/w3c/payment-method-id/pull/67.diff

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