Support webauthn (#17957)

Migrate from U2F to Webauthn

Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -974,9 +974,8 @@ NB: You must have `DISABLE_ROUTER_LOG` set to `false` for this option to take ef
 - `LANGS`: **en-US,zh-CN,zh-HK,zh-TW,de-DE,fr-FR,nl-NL,lv-LV,ru-RU,ja-JP,es-ES,pt-BR,pt-PT,pl-PL,bg-BG,it-IT,fi-FI,tr-TR,cs-CZ,sr-SP,sv-SE,ko-KR,el-GR,fa-IR,hu-HU,id-ID,ml-IN**: List of locales shown in language selector
 - `NAMES`: **English,简体中文,繁體中文（香港）,繁體中文（台灣）,Deutsch,français,Nederlands,latviešu,русский,日本語,español,português do Brasil,Português de Portugal,polski,български,italiano,suomi,Türkçe,čeština,српски,svenska,한국어,ελληνικά,فارسی,magyar nyelv,bahasa Indonesia,മലയാളം**: Visible names corresponding to the locales
 
-## U2F (`U2F`)
-- `APP_ID`: **`ROOT_URL`**: Declares the facet of the application. Requires HTTPS.
-- `TRUSTED_FACETS`: List of additional facets which are trusted. This is not support by all browsers.
+## U2F (`U2F`) **DEPRECATED**
+- `APP_ID`: **`ROOT_URL`**: Declares the facet of the application which is used for authentication of previously registered U2F keys. Requires HTTPS.
 
 ## Markup (`markup`)