This implements Webauthn. Old devices can be used to authenticate via the appid compatibility layer which should be automatic. New devices will be registered via Webauthn, and devices which do not support FIDO2 will no longer be able to be registered. At this time it does not fully support multiple devices (backend does, frontend doesn't allow registration of additional devices). Does not support passwordless.
Allow users to select and save the preferred duo device and method, depending on availability in the duo account. A default enrollment URL is provided and adjusted if returned by the duo API. This allows auto-enrollment if enabled by the administrator.
Closes#594. Closes#1039.
* [DOCS] Update links in README to reference docs.authelia.com.
* Move report section of security to the top level page.
* Fix ordering of sub-pages of 2FA feature.