docs: add new Tutorials

[hvasbath]

• [ ] multi-fault setup
• [ ] multi-event setup (seismic)
• [x] tensile dislocation modeling
• [ ] model in velocity / displacements
• [ ] Lune MTQT source, Lune plot
• [ ] Laplacian rework: nearest neighbor, gaussian, exponential
• [x] fault discretization options: uniform vs resolution based (Atzori et al 2011)
• [ ] prediction covariance for velocity model uncertainties
• [ ] forward modeling using solution_test.yaml
• [ ] Interseismic: Euler pole
• [ ] Interseismic: StrainRate Tensor
• [ ] plotting: 3d slip distribution
• [x] summarize/plotting: derived variables for MT, MTQTSource
• [ ] script section for data loading, how to get LSQ solution, etc