Tutorial reorganization

現在のChapter 1とChapter 7のチュートリアル構成を、一覧にあるチュートリアル項目と併せて確認します。項目のグループ分け案を決定し、合意した再構成を文書化します。完了とは、章の構成とチュートリアルの配置が確定し、更新されている状態を意味します。

Chapter 7 is getting a bit out of control. Meanwhile, Chapter 1 is simultaneously an intro chapter and a "viewer features" chapter. Let's use this issue to discuss some reorganization. For reference, here're the current tutorial entries (that we have code for; so this includes ones that have missing documentation):

Tetgen
FastAutomaticSkinningTransformations
SignedDistance
MeshImplicitFunction
SweptVolume
BiharmonicDeformation
Boolean
GaussianCurvature
ExplodedView
SLIM
HarmonicParam
NRosyDesign
ViewerMenu
CSGTree
AsRigidAsPossible
Events
ScreenCapture
BoundedBiharmonicWeights
CurvatureDirections
MarchingCubes
LaplaceEquation
Decimation
LSCMParam
MEX
ShapeUp
Planarization
AmbientOcclusion
Laplacian
WindingNumber
Statistics
Gradient
GeodesicDistance
BiharmonicCoordinates
Kelvinlets
SCAF
MultipleViews
Triangle
DirectDeltaMush
FileIO
IterativeClosestPoint
FastWindingNumber
MIQ
DualQuaternionSkinning
Picking
MultipleMeshes
MarchingTets
DrawMesh
ARAPParam
Colors
EigenDecomposition
Matlab
Slice
QuadraticProgramming
FacetOrientation
Overlays
Sort
FrameField
BlueNoise
LinearEqualityConstraints
Normals
Subdivision
DataSmoothing
HeatGeodesics
ImGuizmo
PolyharmonicDeformation
Serialization