chore: actioned code review feedback

foundry/.env.arbitrum-one.example

@@ -1,5 +1,5 @@
 ETHERSCAN_API_KEY="" # this must be an arbiscan api key
 FOX_TOKEN_ADDRESS=""
 PRIVATE_KEY=""
-RPC_URL="https://arbitrum-mainnet.infura.io/v3/$INFURA_API_KEY"
+RPC_URL="https://arbitrum-mainnet.infura.io/v3/<INFURA_API_KEY>"
 VERIFIER_URL="https://api.arbiscan.io/api"

foundry/.env.arbitrum-sepolia.example

@@ -1,5 +1,5 @@
 ETHERSCAN_API_KEY="" # this must be an arbiscan api key
 FOX_TOKEN_ADDRESS=""
 PRIVATE_KEY=""
-RPC_URL="https://arbitrum-sepolia.infura.io/v3/$INFURA_API_KEY"
+RPC_URL="https://arbitrum-sepolia.infura.io/v3/<INFURA_API_KEY>"
 VERIFIER_URL="https://api-sepolia.arbiscan.io/api"

foundry/.env.mainnet.example

@@ -1,5 +1,5 @@
 ETHERSCAN_API_KEY=""
 FOX_TOKEN_ADDRESS="0xc770EEfAd204B5180dF6a14Ee197D99d808ee52d"
 PRIVATE_KEY=""
-RPC_URL="https://mainnet.infura.io/v3/$INFURA_API_KEY"
+RPC_URL="https://mainnet.infura.io/v3/<INFURA_API_KEY>"
 VERIFIER_URL="https://api.etherscan.io/api"

foundry/.env.sepolia.example

@@ -1,5 +1,5 @@
 ETHERSCAN_API_KEY=""
 FOX_TOKEN_ADDRESS=""
 PRIVATE_KEY=""
-RPC_URL="https://sepolia.infura.io/v3/$INFURA_API_KEY"
+RPC_URL="https://sepolia.infura.io/v3/<INFURA_API_KEY>"
 VERIFIER_URL="https://api-sepolia.etherscan.io/api"

foundry/README.md

@@ -4,13 +4,19 @@
 
 1. Install foundry https://book.getfoundry.sh/getting-started/installation
 2. Install slither `brew install slither-analyzer`
+3. Set up .env files:
+    1. Copy an example .env file for your chosen environment:
+        ```shell
+        cp .env.<your-chosen-env>.example .env.<your-chosen-env>
+        ```
+    2. Fill in the needed env vars there
 
 ### Private key
 
 To derive a private key 0 from your mnemonic:
 
 ```shell
-cast wallet derive-private-key $MNEMONIC 0
+cast wallet derive-private-key <YOUR_MNEMONIC> 0
 ```
 
 ### Faucets
@@ -25,17 +31,32 @@ https://faucet.circle.com/
 
 ## Deploying
 
+### Local deployment
+Deploying locally is different to deploying directly to a network for 2 reasons:
+1. Its being deployed to a fork of another network (typically ethereum mainnet) rather than a real network.
+2. There's no local instance of etherscan, so etherscan verification is skipped.
+
+When deploying locally, it's necessary to start a local fork before deploying:
+
+```shell
+# RPC_URL for your env can be accessible with `source .env.<your-chosen-env`.
+anvil --rpc-url $RPC_URL
+```
+
+### Deployment steps
+
 ```shell
 cd foundry 
 
 # Install
-make install
+forge install
 
 # Deploy
-./deploy.sh --env arbitrum-sepolia
+./deploy.sh --env <your-chosen-env>
 
-# Test the contract deployed
-cast call $CONTRACT_PROXY_ADDRESS "version()(uint256)" --rpc-url https://arbitrum-sepolia.infura.io/v3/$INFURA_API_KEY
+# Test the proxy contract has been deployed with the correct version.
+# RPC_URL for your env can be accessible with `source .env.<your-chosen-env`.
+cast call <CONTRACT_PROXY_ADDRESS> "version()(uint256)" --rpc-url $RPC_URL
 ```
 
 ### Manually verifying