Add documentation of usage of CBOR in convert and cbordump examples,
add a CBOR overview, and add links to them other places in the
documentation.
Task-number: QTBUG-85912
Change-Id: I518792db63647bf9ddd4507d8d4b7ef056192f82
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
(cherry picked from commit 855a9ca217ad3b9d8eb8f6544698a174323843fc)
Reviewed-by: Ievgenii Meshcheriakov <ievgenii.meshcheriakov@qt.io>
192df6ef47