[w3c/payment-method-basic-card] stub after deprecation (#90)

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/payment-method-basic-card/pull/90.html" title="Last updated on Aug 25, 2021, 9:13 PM UTC (399fdaa)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-method-basic-card/90/5c7d40c...399fdaa.html" title="Last updated on Aug 25, 2021, 9:13 PM UTC (399fdaa)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-method-basic-card/pull/90

-- Commit Summary --

  * stub after deprecation
  * date fix

-- File Changes --

    M index.html (711)

-- Patch Links --

https://github.com/w3c/payment-method-basic-card/pull/90.patch
https://github.com/w3c/payment-method-basic-card/pull/90.diff

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