Removed "Migrating from Cairo v1 to Cairo v2" (#1396)

* Removed "Migrating a contract from Cairo v1 to Cairo v2"

* Update nav.adoc

Author: LandauRaz

components/Starknet/modules/architecture-and-concepts/nav.adoc

@@ -34,7 +34,6 @@
 *** xref:smart-contracts/contract-storage.adoc[Contract storage]
 *** xref:smart-contracts/contract-abi.adoc[Contract ABI]
 *** xref:smart-contracts/starknet-events.adoc[Events]
-*** xref:smart-contracts/contract-syntax.adoc[Migrating a contract from Cairo v1 to Cairo v2]
 *** xref:smart-contracts/cairo-and-sierra.adoc[Cairo and Sierra]
 *** xref:smart-contracts/cairo-builtins.adoc[Cairo builtins]
 *** xref:smart-contracts/serialization-of-cairo-types.adoc[Serialization of Cairo types]