Update readme instructions

README.md

@@ -6,11 +6,13 @@ An agent for [Upkie](https://github.com/upkie/upkie/) that combines wheeled bala
 
 - Install Python packages to a conda environment: `conda env create -f environment.yaml`
 - Activate conda environment: `conda activate pink_balancer`
-- Run the Bullet spine: `./start_simulation.sh` (from your Upkie repository)
-- Run the agent with Bullet: `python pink_balancer/main.py -c bullet`
-- Upload this repository to your Upkie: `make upload`
-- Run the pi3hat spine: `pi3hat_spine` (on your robot)
-- Run the agent: `python pink_balancer/main.py -c $(hostname)`
+- Simulation:
+    - Run the Bullet spine: `./start_simulation.sh` (from your Upkie repository)
+    - Run the agent: `python run_agent.py -c bullet`
+- Real Upkie:
+    - Upload this repository to your Upkie: `make upload`
+    - Run the pi3hat spine: `pi3hat_spine` (on your robot)
+    - Run the agent: `python run_agent.py`
 
 ## Configuration tweaks