make notebooks on different image formation pipelines

[geoffwoollard]

Make notebook(s) with different detectors, etc illustration the components that can be mixed and matched.

[mjo22]

With #224, a nice idea may be a notebook that compares methods of computing projection images. We can compare images and power spectra of

• Projections directly from gaussians
• Fourier slice using linear and cubic interpolation
• Projections using nuffts

Then, we can choose one of these to compare against an implementation with ewald sphere curvature. We could write out the condition where the ewald sphere is expected to be important and make a plot showing the ewald sphere give increasingly different high resolution information.