Improvements

[MatthewFilipovich]

• Add tests to ensure all relevant profiles are properly normalized (e.g., Gaussians)
• Add normalization factors in docstring of normalized profiles (e.g., Gaussians)
• Refactor tosrc/ layout
• Change to absolute imports
• type_defs -> types
• uv.lock with updated contribution file & remove requirements.txt
• Possibly combine docs requirements with dev in pyproject?
• Update CONTRIBUTING.md for serving sphinx
• Docs section on ASM vs DIM
• asm_pad_factor -> asm_pad and default None which automatically chooses value that works (2x always)
• -> Python 3.10... remove Optional
• Update package build system using hatchling - follow Simple Packaging guide
• add * in measure and propagate methods
• gui