Fix README usage command

- curl and unzip were pipe-chained, but -o writes to a file so the pipe
  produced nothing; split into separate steps with &&
- Extracted directory is bootstrap_dev_env-main, not bootstrap
- Script is bootstrap_environment.py, not bootstrap_dev_env

https://claude.ai/code/session_01CkJR1eHoBVMyNNeGdbRBYK

README.md

@@ -1,7 +1,8 @@
 # Usage
 
 ``` shell
-curl -L -o bootstrap.zip https://github.com/JMR-dev/bootstrap_dev_env/archive/refs/heads/main.zip | unzip bootstrap.zip \
-cd bootstrap \
-python bootstrap_dev_env \
+curl -L -o bootstrap.zip https://github.com/JMR-dev/bootstrap_dev_env/archive/refs/heads/main.zip && \
+unzip bootstrap.zip && \
+cd bootstrap_dev_env-main && \
+python3 bootstrap_environment.py
 ```