DOCSP-23061 remove using mongosync (#22)

Author: Dave Cuthbert

source/index.txt

@@ -27,11 +27,6 @@ To get started with ``mongosync``, refer to the :ref:`Quick Start Guide
 :ref:`c2c-install` or :ref:`c2c-connecting` page that best fits your
 situation.
 
-To learn more about ``mongosync`` use cases, see:
-
-- :ref:`Continuous synchronization <c2c-uses-continue-sync>`
-- :ref:`Data migration <c2c-uses-migration>`
-
 The :ref:`Frequently Asked Questions (FAQ) <c2c-faq>` page addresses
 common questions users have asked about ``mongosync``.
 
@@ -40,7 +35,6 @@ common questions users have asked about ``mongosync``.
 
    /quickstart
    /installation
-   /using-mongosync
    /connecting
    /reference
    /release-notes