Docs inconsistency: cargo build and localnet.sh expect different output directories

[noorgme]

Problem

The documentation at https://docs.bittensor.com/developer-docs/subnet-development instructs users to run:

1. cargo build -p node-subtensor --profile production --features pow-faucet

2. BUILD_BINARY=0 ./scripts/localnet.sh

However, this results in errors because:

• The build command outputs the binary to target/production/release/node-subtensor
• The localnet.sh script expects a fast-blocks build located at target/fast-blocks/release/node-subtensor

Suggested Fix

Update the docs to either:

1. Match the script by telling users to build using:
   CARGO_TARGET_DIR=target/fast-blocks cargo build -p node-subtensor --profile=release --features="pow-faucet fast-blocks"

OR

2. Modify localnet.sh to optionally use production as the default target dir when BUILD_BINARY=0.

Thanks for the great project!