Update csst_cpic_sim/__init__.py, csst_cpic_sim/camera.py,...

Update csst_cpic_sim/__init__.py, csst_cpic_sim/camera.py, csst_cpic_sim/config.py, csst_cpic_sim/io.py, csst_cpic_sim/main.py, csst_cpic_sim/optics.py, csst_cpic_sim/psf_simulation.py, csst_cpic_sim/target.py, csst_cpic_sim/utils.py
Deleted csst_cpic_sim/.gitkeep