☂️ Migrate SMS format from other places

[hober]

• [x] Publish sms-one-time-codes explainer and spec
• [x] Add sms-one-time-codes to WICG's biblio.json
  • [x] Wait for this to propagate to https://github.com/tobie/specref/blob/master/refs/wicg.json
  • [x] Wait for this to propagate to https://github.com/tabatkins/bikeshed-data biblio
  • [x] Get one of Fantasai, Peter, or Tab to update https://github.com/tabatkins/bikeshed-data anchors
• [x] Update WebOTP to cite sms-one-time-codes
• [x] Drop the old explainer from webkit/explainers
• [x] Transfer or resolve related issues filed in webkit/explainers
  • [x] https://github.com/WebKit/explainers/issues/8
  • [x] https://github.com/WebKit/explainers/issues/11
  • [x] https://github.com/WebKit/explainers/issues/25
  • [x] https://github.com/WebKit/explainers/issues/28
• [x] Transfer or resolve related issues filed in WICG/WebOTP
  • [x] https://github.com/WICG/WebOTP/issues/5
  • [x] https://github.com/WICG/WebOTP/issues/15

[hober]

This is just waiting on WICG/WebOTP#41 being merged.