Remove LDAP specific auth howto document

This needs a lot more work before it is useful, so we
remove it for now.

docs/howto/auth/ldap.rst

@@ -1,46 +0,0 @@
-.. _howto/auth/ldap:
-
-=============================
-Using LDAP for authentication
-=============================
-
-`LDAP <https://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol>`_
-is an open and widely-used protocol for authentication.
-
-The `LDAPAuthenticator's documentation <https://github.com/jupyterhub/ldapauthenticator#required-configuration>`_
-lists the various configuration options you can set for LDAPAuthenticator. You can set them
-in TLJH with the following pattern:
-
-.. code-block:: bash
-
-   sudo -E tljh-config set auth.<authenticator-name>.<config-option-name> <config-option-value>
-
-When the documentation asks you to set ``LDAPAuthenticator.server_address`` to some
-value, you can do that with the following command:
-
-.. code-block:: bash
-
-   sudo -E tljh-config set auth.LDAPAuthenticator.server_address = 'my-ldap-server'
-
-Enabling the authenticator
-==========================
-
-For LDAPAuthenticator, the fully qualified name is ``ldapauthenticator.LDAPAuthenticator``.
-This is the same name that the `documentation asks <https://github.com/jupyterhub/ldapauthenticator#usage>`_
-you to set ``c.JupyterHub.authenticator_class`` to.
-
-For LDAPAuthenticator, this would be:
-
-.. code-block:: bash
-
-   sudo -E tljh-config set auth.type ldapauthenticator.LDAPAuthenticator
-
-Once enabled, you need to reload JupyterHub for the config to take effect.
-
-.. code-block:: bash
-
-   sudo -E tljh-config reload
-
-Try logging in a separate incognito window to check if your configuration works. This
-lets you preserve your terminal in case there were errors. If there are
-errors, :ref:`troubleshooting/logs` should help you debug them.