docs: remove references to VRT

Author: chechu

deployed-contracts/markets.md

@@ -46,7 +46,6 @@
   * USDT: [`0x55d398326f99059fF775485246999027B3197955`](https://bscscan.com/address/0x55d398326f99059fF775485246999027B3197955)
   * UST: [`0x3d4350cD54aeF9f9b2C29435e0fa809957B3F30a`](https://bscscan.com/address/0x3d4350cD54aeF9f9b2C29435e0fa809957B3F30a)
   * VAI: [`0x4BD17003473389A42DAF6a0a729f6Fdb328BbBd7`](https://bscscan.com/address/0x4BD17003473389A42DAF6a0a729f6Fdb328BbBd7)
-  * VRT: [`0x5f84ce30dc3cf7909101c69086c50de191895883`](https://bscscan.com/address/0x5f84ce30dc3cf7909101c69086c50de191895883)
   * WBETH: [`0xa2e3356610840701bdf5611a53974510ae27e2e1`](https://bscscan.com/address/0xa2e3356610840701bdf5611a53974510ae27e2e1)
   * XRP: [`0x1D2F0da169ceB9fC7B3144628dB156f3F6c60dBE`](https://bscscan.com/address/0x1D2F0da169ceB9fC7B3144628dB156f3F6c60dBE)
   * XVS: [`0xcF6BB5389c92Bdda8a3747Ddb454cB7a64626C63`](https://bscscan.com/address/0xcF6BB5389c92Bdda8a3747Ddb454cB7a64626C63)

technical-reference/contracts-overview.md

@@ -126,16 +126,12 @@ Revenue earned by the protocol is kept in the [VTreasury](https://github.com/Ven
 
 [**XVS**](../tokens/xvs.md)
 
-XVS is an important token in the Venus ecosystem because it powers Venus governance. The [XVS](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/XVS/XVS.sol) token contract defines a lockable BEP20 token with additional methods that enable voting and vote delegation. To vote, a user must first lock their XVS in the vault. The [XVSVesting](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/XVS/XVSVesting.sol) controlled XVS emissions when converting VRT to XVS. The time period to convert VRT to XVS has expired.
+XVS is an important token in the Venus ecosystem because it powers Venus governance. The [XVS](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/XVS/XVS.sol) token contract defines a lockable BEP20 token with additional methods that enable voting and vote delegation. To vote, a user must first lock their XVS in the vault.
 
 [**VAI**](../tokens/vai.md)
 
 [VAI](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/VAI/VAI.sol) is the Venus stable coin that can be minted against collateral. Users who mint VAI are charged a fee based on the outstanding supply and price of VAI to keep its value pegged at $1. The [VAIController](https://github.com/VenusProtocol/venus-protocol/blob/develop/contracts/Tokens/VAI/VAIController.sol) controls the amount of VAI a user is allowed to mint which is determined by the collateral a user has provided and their liquidity.
 
-**VRT**
-
-The Venus Rewards Token (VRT) is composed two contracts - the token contract and the converter contract. The [VRT](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/VRT/VRT.sol) token contract defines a lockable BEP20 token, which allows the token to be staked in order to earn additional VRT tokens. The [VRTConverter](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/VRT/VRTConverter.sol) allows VRT to be converted to XVS.
-
 [**vTokens**](reference-core-pool/vtoken.md)
 
 When a user supplies a token to the protocol, vTokens are minted to represent their supply. The [VToken](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Tokens/VTokens/VBep20.sol) contract contains methods that support lending activities for the asset including lending, borrowing and liquidating
@@ -150,10 +146,6 @@ XVS can be locked in the [XVSVault](https://github.com/VenusProtocol/venus-proto
 
 VAI staked in the [VAIVault](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/Vault/VAIVault.sol) earn XVS. Staking rewards are accumulated daily.
 
-**VRT Vault**
-
-The [VRTVault](https://github.com/VenusProtocol/venus-protocol/blob/main/contracts/VRTVault/VRTVault.sol) allows users to stake VRT and earn VRT daily. Rewards are accrued daily similar to the other vaults.
-
 #### Misc Contracts
 
 **ComptrollerLens**