fix: update the switchToTestnet mdx

website/docs/dapp/_SwitchToTestnet.mdx

@@ -1,23 +1,9 @@
-So now your app works great on the local blockchain, you might want to switch it to different environments like Testnet and Mainnet.
+So now your dApp works great on the local blockchain, you might want to switch it to different environments like Testnet and Mainnet.
 
-To do this, you need to update the chain config and related code.
-
-Open the `ckb.ts` in your project root dir, change the `lumosConfig` and `CKB_RPC_URL`:
-
-```ts
-//export const lumosConfig: config.Config = devConfig as config.Config;
-export const lumosConfig = config.predefined.AGGRON4 as config.Config;
-
-//export const CKB_RPC_URL = 'http://localhost:8114';
-export const CKB_RPC_URL = "https://testnet.ckb.dev/rpc";
-```
-
-Actually, we have the corresponding Testnet version examples for all these tutorials. The source code of the Testnet version is in [https://github.com/nervosnetwork/docs.nervos.org/tree/develop/examples](https://github.com/nervosnetwork/docs.nervos.org/tree/develop/examples), you can clone the repo and start running on Testnet.
+To do that, just change the environment variable `NETWORK` to `testnet`:
 
 ```sh
-git clone https://github.com/nervosnetwork/docs.nervos.org.git
-cd docs.nervos.org/examples/<example-name>
-yarn && yarn start
+export NETWORK=testnet
 ```
 
-For more details, check out the [README.md](https://github.com/nervosnetwork/docs.nervos.org/blob/develop/examples/simple-transfer/README.md);
+For more details, check out the <a href={props.readmeLink}>README.md</a>.

website/docs/dapp/create-dob.mdx

@@ -180,7 +180,7 @@ By following this tutorial this far, you have mastered how digital-object works
 
 ## Next Step
 
-<SwitchToTestnet />
+<SwitchToTestnet readmeLink="https://github.com/nervosnetwork/docs.nervos.org/blob/develop/examples/create-dob/README.md" />
 
 ## Additional Resources
 

website/docs/dapp/create-token.mdx

@@ -309,7 +309,7 @@ By following this tutorial this far, you have mastered how custom tokens work on
 
 ## Next Step
 
-<SwitchToTestnet />
+<SwitchToTestnet readmeLink="https://github.com/nervosnetwork/docs.nervos.org/blob/develop/examples/xudt/README.md" />
 
 ## Additional Resources
 

website/docs/dapp/transfer-ckb.mdx

@@ -279,7 +279,7 @@ By following this tutorial this far, you have mastered how transfer balance work
 
 ## Next Step
 
-<SwitchToTestnet />
+<SwitchToTestnet readmeLink="https://github.com/nervosnetwork/docs.nervos.org/blob/develop/examples/simple-transfer/README.md" />
 
 ## Additional Resources
 

website/docs/dapp/write-message.mdx

@@ -247,7 +247,7 @@ By following this tutorial this far, you have mastered how storing data on Cells
 
 ## Next Step
 
-<SwitchToTestnet />
+<SwitchToTestnet readmeLink="https://github.com/nervosnetwork/docs.nervos.org/blob/develop/examples/write-and-read-message/README.md" />
 
 ## Additional Resources