Move Demos to CIL-Demos

[paskino]

• [x] Tomography

  • [x] Simulated
    • [x] Single Channel
    • [x] Multi Spectral
    • [x] Dynamic
    • [x] Real Data
    • [x] Cone Beam
    • [ ] Parallel Beam

• [x] Denoising

  • [x] Dynamic
  • [x] 2D
  • [x] 3D

  • [ ] I/O

  • [ ] Algorithms

    • [ ] PDHG
    • [ ] FISTA
    • [ ] CGLS
    • [ ] Gradient Descent
    • [ ] SIRT

[paskino]

Colour bay demo is in https://github.com/vais-ral/CCPi-Framework/pull/238

[paskino]

also the ccpi-astra demos

[paskino]

Closed by #352