Merge the two 2FA docs into one

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-# Two-factor Authentication (2FA)
-
-Two-factor Authentication (2FA) provides an additional level of security to your
-GitLab account. Once enabled, in addition to supplying your username and
-password to login, you'll be prompted for a code generated by an application on
-your phone.
-
-By enabling 2FA, the only way someone other than you can log into your account
-is to know your username and password *and* have access to your phone.
-
-> **Note:**
-When you enable 2FA, don't forget to back up your recovery codes. For your safety, if you
-lose your codes for GitLab.com, we can't disable or recover them.  
-
-In addition to a phone application, GitLab supports U2F (universal 2nd factor) devices as
-the second factor of authentication. Once enabled, in addition to supplying your username and
-password to login, you'll be prompted to activate your U2F device (usually by pressing
-a button on it), and it will perform secure authentication on your behalf.
-
-> **Note:** Support for U2F devices was added in version 8.8
-
-The U2F workflow is only supported by Google Chrome at this point, so we _strongly_ recommend 
-that you set up both methods of two-factor authentication, so you can still access your account 
-from other browsers.
-
-> **Note:** GitLab officially only supports [Yubikey] U2F devices.
-
-## Enabling 2FA
-
-### Enable 2FA via mobile application
-
-**In GitLab:**
-
-1. Log in to your GitLab account.
-1. Go to your **Profile Settings**.
-1. Go to **Account**.
-1. Click **Enable Two-factor Authentication**.
-
-![Two-factor setup](2fa.png)
-
-**On your phone:**
-
-1. Install a compatible application. We recommend [Google Authenticator]
-\(proprietary\) or [FreeOTP] \(open source\).
-1. In the application, add a new entry in one of two ways:
-    * Scan the code with your phone's camera to add the entry automatically.
-    * Enter the details provided to add the entry manually.
-
-**In GitLab:**
-
-1. Enter the six-digit pin number from the entry on your phone into the **Pin
-   code** field.
-1. Click **Submit**.
-
-If the pin you entered was correct, you'll see a message indicating that
-Two-Factor Authentication has been enabled, and you'll be presented with a list
-of recovery codes.
-
-### Enable 2FA via U2F device
-
-**In GitLab:**
-
-1. Log in to your GitLab account.
-1. Go to your **Profile Settings**.
-1. Go to **Account**.
-1. Click **Enable Two-Factor Authentication**.
-1. Plug in your U2F device.
-1. Click on **Setup New U2F Device**.
-1. A light will start blinking on your device. Activate it by pressing its button.
-
-You will see a message indicating that your device was successfully set up. 
-Click on **Register U2F Device** to complete the process.
-
-![Two-Factor U2F Setup](2fa_u2f_register.png)
-
-## Recovery Codes
-
-Should you ever lose access to your phone, you can use one of the ten provided
-backup codes to login to your account. We suggest copying or printing them for
-storage in a safe place. **Each code can be used only once** to log in to your
-account.
-
-If you lose the recovery codes or just want to generate new ones, you can do so
-from the **Profile Settings** > **Account** page where you first enabled 2FA.
-
-> **Note:** Recovery codes are not generated for U2F devices.
-
-## Logging in with 2FA Enabled
-
-Logging in with 2FA enabled is only slightly different than a normal login.
-Enter your username and password credentials as you normally would, and you'll
-be presented with a second prompt, depending on which type of 2FA you've enabled.
-
-### Log in via mobile application
-
-Enter the pin from your phone's application or a recovery code to log in.
-
-![Two-Factor Authentication on sign in via OTP](2fa_auth.png)
-
-### Log in via U2F device
-
-1. Click **Login via U2F Device**
-1. A light will start blinking on your device. Activate it by pressing its button.
-
-You will see a message indicating that your device responded to the authentication request.
-Click on **Authenticate via U2F Device** to complete the process.
-
-![Two-Factor Authentication on sign in via U2F device](2fa_u2f_authenticate.png)
-
-## Disabling 2FA
-
-1. Log in to your GitLab account.
-1. Go to your **Profile Settings**.
-1. Go to **Account**.
-1. Click **Disable**, under **Two-Factor Authentication**.
-
-This will clear all your two-factor authentication registrations, including mobile
-applications and U2F devices.
-
-## Personal access tokens
-
-When 2FA is enabled, you can no longer use your normal account password to
-authenticate with Git over HTTPS on the command line, you must use a personal
-access token instead.
-
-1. Log in to your GitLab account.
-1. Go to your **Profile Settings**.
-1. Go to **Access Tokens**.
-1. Choose a name and expiry date for the token.
-1. Click on **Create Personal Access Token**. 
-1. Save the personal access token somewhere safe.
-
-When using git over HTTPS on the command line, enter the personal access token
-into the password field.
-
-## Note to GitLab administrators
-
-You need to take special care to that 2FA keeps working after
-[restoring a GitLab backup](../raketasks/backup_restore.md).
-
-[Google Authenticator]: https://support.google.com/accounts/answer/1066447?hl=en
-[FreeOTP]: https://fedorahosted.org/freeotp/
-[YubiKey]: https://www.yubico.com/products/yubikey-hardware/
+This document was moved to [user/profile/account](../user/profile/account/two_factor_authentication.md).