Modified header configuration

content/energy.md

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 jupytext:
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-  display_name: Python 3
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+    display_name: Python 3 (ipykernel)
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 ---
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 (ch:energy)=
 # Energy
 

content/entropy.md

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+    display_name: Python 3 (ipykernel)
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 (ch:entropy)=
 # Heat engines, entropy, and free energy
 

content/fluiddynamics.md

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+    display_name: Python 3 (ipykernel)
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 ---
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 (ch:fluiddynamics)=
 # Fluid dynamics
 

content/forces.md

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 ---
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 (ch:forces)=
 # Forces
 

content/generalplanarmotion.md

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 (ch:planarmotion)=
 # General planar motion
 

content/linearalgebra.md

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-  display_name: Python 3
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 ---
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 (app:linalg)=
 # Linear algebra
 

content/mechanicsintroduction.md

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 (ch:mechanicsintroduction)=
 # Introduction to classical mechanics
 

content/momentum.md

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-  display_name: Python 3
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 (ch:momentum)=
 # Momentum
 

content/oscillations.md

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 (ch:oscillations)=
 # Oscillations
 

content/rotationalmotion.md

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 (ch:rotation)=
 # Rotational motion, torque and angular momentum
 

content/solidsandfluids.md

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 (ch:solidfluid)=
 # Solids and fluids
 

content/thermodynamicsbasics.md

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 (ch:thermodynamics)=
 # The basic principles of thermodynamics
 

content/waves.md

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+    display_name: Python 3 (ipykernel)
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+    name: python3
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 (ch:waves)=
 # Waves