Update landings page links (#953)

* update c++ links

Author: rachel-mack

source/cxx.txt

@@ -25,14 +25,14 @@ Introduction
 ------------
 
 Welcome to the documentation site for the official MongoDB C++ driver.
-You can add the driver to your application to work with MongoDB using
-the C++11 or later standard. Download the library, ``mongocxx``,
-from `mongocxx.org <https://mongocxx.org/mongocxx-v3/installation/>`__
-or set up a runnable project by following our tutorial.
+You can add the driver to your application to work with MongoDB by using
+the C++11 or later standard.
 
-- `Tutorial <https://mongocxx.org/mongocxx-v3/tutorial/>`__
+- `Installation <https://www.mongodb.com/docs/languages/cpp/drivers/current/installation/>`__
 
-- `Usage Guide <https://mongocxx.org/mongocxx-v3/>`__
+- `Tutorial <https://www.mongodb.com/docs/languages/cpp/drivers/current/tutorial/>`__
+
+- `Usage Guide <https://www.mongodb.com/docs/languages/cpp/drivers/current/>`__
 
 - `MongoDB Developer Center <https://www.mongodb.com/developer/languages/cpp/>`__
 
@@ -44,12 +44,6 @@ or set up a runnable project by following our tutorial.
 
 - `Examples <https://github.com/mongodb/mongo-cxx-driver/tree/master/examples>`__
 
-
-Installation
-------------
-
-See `Installing the mongocxx driver <https://mongocxx.org/mongocxx-v3/installation/>`__.
-
 .. _connect-atlas-cxx-driver:
 
 Connect to MongoDB Atlas