Update structure

2-perception/ar-textures/ar-textures.tex

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+\mainchapter{Augmenting the Texture Perception of Tangible Surfaces in Augmented Reality using Vibrotactile Haptics}
+\label{ch:ar-textures}

2-perception/perception.tex

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+\part{Augmenting the Visuo-haptic Texture Perception of Tangible Surfaces}
+\label{part:texture}

2-perception/xr-perception/xr-perception.tex

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+\mainchapter{Perception of Visual-Haptic Texture Augmentation in Augmented and Virtual Reality}
+\label{ch:xr-perception}
+