add https and ldap guidelines

docs/docs/installation/configuring-superset.mdx

@@ -149,6 +149,11 @@ If you're not using Gunicorn, you may want to disable the use of `flask-compress
 Currently, Google BigQuery python sdk is not compatible with `gevent`, due to some dynamic monkeypatching on python core library by `gevent`.
 So, when you use `BigQuery` datasource on Superset, you have to use `gunicorn` worker type except `gevent`.
 
+### HTTPS Configuration
+
+You can configure HTTPS upstream via a load balancer or an nginx reverse proxy and do TLS Offloading before it reaches Superset App.
+You can also configure [SSL in Gunicorn](https://docs.gunicorn.org/en/stable/settings.html#ssl) (the Python webserver) if you are using an official Superset Docker image.
+
 ### Configuration Behind a Load Balancer
 
 If you are running superset behind a load balancer or reverse proxy (e.g. NGINX or ELB on AWS), you
@@ -265,6 +270,12 @@ CUSTOM_SECURITY_MANAGER = CustomSsoSecurityManager
   ]
   ```
 
+### LDAP Authentication
+
+FAB allows to authenticate the user’s credentials against an LDAP server.
+To use LDAP you need to install [python-ldap](https://www.python-ldap.org/en/latest/installing.html).
+Please refer [FAB's LDAP documentation](https://flask-appbuilder.readthedocs.io/en/latest/security.html#authentication-ldap) for configuration details.
+
 ### Flask app Configuration Hook
 
 `FLASK_APP_MUTATOR` is a configuration function that can be provided in your environment, receives