Updated tutorials

Author: fpalacios

_tutorials/design_features/Inviscid_2D_Unconstrained_NACA0012.md

@@ -1,6 +1,6 @@
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 title: Unconstrained shape design of a transonic inviscid airfoil at a cte. AoA
-permalink: /docs/Inciscid_2D_Unconstrained_NACA0012/
+permalink: /tutorials/Inciscid_2D_Unconstrained_NACA0012/
 ---
 
 ![Optimization Diagram](../../Inciscid_2D_Unconstrained_NACA0012/images/optimization_diagram.png)

_tutorials/design_features/Inviscid_3D_Constrained_ONERAM6.md

@@ -1,6 +1,6 @@
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 title: Constrained shape design of a transonic inviscid wing at a cte. C<sub>L</sub>
-permalink: /docs/Inviscid_3D_Constrained_ONERAM6/
+permalink: /tutorials/Inviscid_3D_Constrained_ONERAM6/
 ---
 
 ![Opt. ONERA Orig](../../Inviscid_3D_Constrained_ONERAM6/images/onera_opt_history.png)

_tutorials/design_features/Turbulent_2D_Constrained_RAE2822.md

@@ -1,6 +1,6 @@
 ---
 title: Constrained shape design of a transonic turbulent airfoil at a cte. C<sub>L</sub> 
-permalink: /docs/Turbulent_2D_Constrained_RAE2822/
+permalink: /tutorials/Turbulent_2D_Constrained_RAE2822/
 ---
 
 ## Goals