Deprecate ics20-v2 (#1214)

* deprecate ics20-v2

* fix top-level README

* fix links

Author: AdityaSripal

README.md

@@ -59,8 +59,8 @@ All standards at or past the "Draft" stage are listed here in order of their ICS
 
 | Interchain Standard Number                               | Version | Standard Title          | Stage     | Implementations                                                                                                           | Maintainer         |
 | -------------------------------------------------------- | ------- | ----------------------- | --------- | ------------------------------------------------------------------------------------------------------------------------- | ------------------ |
-| [20](spec/app/ics-020-fungible-token-transfer/README.md) | v2      | Fungible Token Transfer | Candidate | [ibc-go](https://github.com/cosmos/ibc-go/tree/ics20-v2-beta.0/modules/apps/transfer)                                     | Protocol team      |
-| [20](spec/app/ics-020-fungible-token-transfer/v1/README.md) | v1      | Fungible Token Transfer | Candidate | [ibc-go](https://github.com/cosmos/ibc-go/tree/main/modules/apps/transfer), [ibc-rs](https://github.com/cosmos/ibc-rs/tree/main/ibc-apps/ics20-transfer) | Protocol team      |
+| [20](spec/app/ics-020-fungible-token-transfer/README.md) | v1      | Fungible Token Transfer | Candidate | [ibc-go](https://github.com/cosmos/ibc-go/tree/main/modules/apps/transfer), [ibc-rs](https://github.com/cosmos/ibc-rs/tree/main/ibc-apps/ics20-transfer)    | Protocol team      |
+| [20](spec/app/ics-020-fungible-token-transfer/deprecated/README.md) | v2      | Fungible Token Transfer | DEPRECATED |  | Protocol team      |
 | [27](spec/app/ics-027-interchain-accounts/README.md)     | v1      | Interchain Accounts     | Candidate | [ibc-go](https://github.com/cosmos/ibc-go/tree/main/modules/apps/27-interchain-accounts)                                  | Protocol team      | 
 | [28](spec/app/ics-028-cross-chain-validation/README.md)  | v1      | Cross-Chain Validation  | Candidate | [interchain-security](https://github.com/cosmos/interchain-security/tree/main)                                            | Cosmos Hub team    |
 | [29](spec/app/ics-029-fee-payment)                       | v1      | General Relayer Incentivization Mechanism | DEPRECATED |                                                   | Protocol team      |