docs(contracts): update documentation to reflect the latest changes

website/versioned_docs/version-v1.x/circuits.md

@@ -436,14 +436,22 @@ Before building the project, make sure you have the following dependencies insta
 
 ### Building MACI circuits
 
-To build the two main circuits of MACI, run the following commands:
+To build the main circuits of MACI, run the following command (`-c` postfix for c++ witness gen, and `-wasm` postfix for WASM witness gen only):
 
 ```
-circom --r1cs --sym --wasm --output ./build circom/test/processMessages_10-2-1-2_test.circom
-circom --r1cs --sym --wasm --output ./build circom/test/tallyVotes_10-1-2_test.circom
+pnpm build-test-circuits-c
+pnpm build-test-circuits-wasm
 ```
 
-Please note that the circuit is configured with testing purpose parameters, which means it can only handle a limited amount of messages (up to 25 messages). For more information on the parameters and how to configure them, refer to [this page](/docs/circuits/#compile-circuits).
+Please note that the circuits are configured with testing purpose parameters, which means it can only handle a limited amount of messages (up to 25 messages). For more information on the parameters and how to configure them, please refer to the individual circuit documentation within this page. Also, within the [configure-circomkit](https://maci.pse.dev/docs/installation#configure-circomkit) section of the `installation` page, you'll see how you can update the config file with new params.
+
+To compile a single circuit, you can run:
+
+```
+pnpm circom:build $CIRCUIT_NAME
+```
+
+> Please note that the name should match one of the circuit names inside the `circom.json` file.
 
 ### Generating zKeys