[w3c/payment-method-id] Deprecate basic card (#66)

* Removed basic-card from list of standardized payment method identifiers.
* Left the string as an example in section on validity check, but note that it is no longer in development.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/payment-method-id/pull/66.html" title="Last updated on Aug 26, 2021, 2:06 PM UTC (ae4df00)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-method-id/66/ebf390f...ae4df00.html" title="Last updated on Aug 26, 2021, 2:06 PM UTC (ae4df00)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-method-id/pull/66

-- Commit Summary --

  * removed extra "the"
  * Merge branch 'gh-pages' of github.com:w3c/payment-method-id into gh-pages
  * Merge branch 'gh-pages' of github.com:w3c/payment-method-id into gh-pages
  * Merge branch 'gh-pages' of github.com:w3c/payment-method-id into gh-pages
  * Merge branch 'gh-pages' of github.com:w3c/payment-method-id into gh-pages
  * deprecate basic card

-- File Changes --

    M index.html (21)

-- Patch Links --

https://github.com/w3c/payment-method-id/pull/66.patch
https://github.com/w3c/payment-method-id/pull/66.diff

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