Documentation: reorganized list of tutorials

\page Tutorials Tutorials

## Basic topics

1. [General concepts](./GeneralConcepts/tutorial_GeneralConcepts.md)

2. [Arrays](./Arrays/tutorial_Arrays.md)

3. [Vectors](./Vectors/tutorial_Vectors.md)

5. [For loops](./ForLoops/tutorial_ForLoops.md)

6. [Sorting](./Sorting/tutorial_Sorting.md)

7. [Cross-device pointers](./Pointers/tutorial_Pointers.md)

8. [Matrices](./Matrices/tutorial_Matrices.md)

9. [Linear solvers](./Solvers/Linear/tutorial_Linear_solvers.md)

10. [Segments aka sparse formats](./Segments/tutorial_Segments.md)

11. [ODE solvers](./Solvers/ODE/tutorial_ODE_solvers.md)

12. [Unstructured meshes](./Meshes/tutorial_Meshes.md)

## Data structures

1. [Matrices](./Matrices/tutorial_Matrices.md)

2. [Segments aka sparse formats](./Segments/tutorial_Segments.md)

3. [Unstructured meshes](./Meshes/tutorial_Meshes.md)

## Numerical solvers

1. [Linear solvers](./Solvers/Linear/tutorial_Linear_solvers.md)

2. [ODE solvers](./Solvers/ODE/tutorial_ODE_solvers.md)