Reverting 'Two-factor authentication' support as it cause OSX and docker build failures.

This reverts commit 787a441343.

docs/en_US/getting_started.rst

@@ -33,7 +33,6 @@ Mode is pre-configured for security.
 
    deployment
    login
-   mfa
    user_management
    change_user_password
    restore_locked_user

docs/en_US/mfa.rst

@@ -1,88 +0,0 @@
-.. _mfa:
-
-*************************************************
-`Enabling two-factor authentication (2FA)`:index:
-*************************************************
-
-About two-factor authentication
-===============================
-Two-factor authentication (2FA) is an extra layer of security used when logging
-into websites or apps. With 2FA, you have to log in with your username and
-password and provide another form of authentication that only you know or have
-access to.
-
-
-Setup two-factor authentication
-===============================
-To set up 2FA for pgAdmin 4, you must configure the Two-factor Authentication
-settings in *config_local.py* or *config_system.py* (see the
-:ref:`config.py <config_py>` documentation) on the system where pgAdmin is
-installed in Server mode. You can copy these settings from *config.py* file and
-modify the values for the following parameters.
-
-.. csv-table::
-   :header: "**Parameter**", "**Description**"
-   :class: longtable
-   :widths: 35, 55
-
-   "MFA_ENABLED","The default value for this parameter is False.
-   To enable 2FA, set the value to *True*"
-   "SUPPORTED_MFA_LIST", "Set the authentication methods to be supported "
-   "MFA_EMAIL_SUBJECT", "<APP_NAME> - Verification Code e.g. pgAdmin 4 -
-   Verification Code"
-   "MFA_FORCE_REGISTRATION", "Force the user to configure the authentication
-   method on login (if no authentication is already configured)."
-
-
-Configure two-factor authentication
-===================================
-To configure 2FA for a user, you must click on 'Two-factor Authentication'
-in the `User` menu in right-top corner. It will list down all the supported
-multi factor authentication methods. Click on 'Setup' of one of those methods
-and follow the steps for each authentication method. You will see the `Delete`
-button for the authentication method, which is already been configured.
-Clicking on `Delete` button will deregister the authentication method for the
-current user.
-
-.. image:: images/mfa_registration.png
-    :alt: Configure two-factor authentication
-    :align: center
-
-You can also force users to configure the two-factor
-authentication methods on login by setting *MFA_FORCE_REGISTRATION* parameter
-to *True*.
-
-Email authentication
-====================
-
-To setup email authentication click on the `Setup` button besides of the
-'Email authentication' label.
-
-.. image:: images/mfa_email.png
-    :alt: Configure two-factor authentication
-    :align: center
-
-Enter the valid email address to send the validation code. Once you get the
-validation code enter that code to setup the email authentication.
-
-*NOTE: You must set the 'Mail server settings' in config_local.py or
-config_system.py in order to use 'email' as two-factor authentication method
-(see the* :ref:`config.py <config_py>` *documentation).*
-
-Authenticator App
-=================
-
-To setup using any authenticator application which supports Time based One
-Time Password (TOTP) click on the `Setup` button besides of the
-'Authenticator App' label.
-
-.. image:: images/mfa_auth_app.png
-    :alt: Configure two-factor authentication
-    :align: center
-
-After the setup when you logged in to the pgAdmin 4 again, it will provide
-the option to authenticate using email or authenticator app.
-
-.. image:: images/mfa_login.png
-    :alt: Configure two-factor authentication
-    :align: center

docs/en_US/release_notes_6_0.rst

@@ -10,7 +10,6 @@ New features
 ************
 
 | `Issue #4211 <https://redmine.postgresql.org/issues/4211>`_ -  Added support for OWNED BY Clause for sequences.
-| `Issue #6543 <https://redmine.postgresql.org/issues/6543>`_ -  Added support for Two-factor authentication for improving security.
 
 Housekeeping
 ************