Remove duplicated documentation (#720)

docs/first_steps.md

@@ -171,41 +171,12 @@ And we display the initial data.
 
 \snippet{trimleft} uniform_heat_equation.cpp initial-display
 
-\snippet{trimleft} uniform_heat_equation.cpp time iteration
-
-To display the data, a chunk is created on the host using the \ref ddc::create_mirror function.
-
-\snippet{trimleft} uniform_heat_equation.cpp host-chunk
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-We deepcopy the data from the `ghosted_last_temp` chunk to `ghosted_temp` on the host.
-
-\snippet{trimleft} uniform_heat_equation.cpp boundary conditions
-
-\snippet{trimleft} uniform_heat_equation.cpp initial-deepcopy
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-And we display the initial data.
-
-\snippet{trimleft} uniform_heat_equation.cpp initial-display
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-For the numerical scheme, two chunkspans are created:
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-* `next_temp` a span excluding ghosts of the temperature at the time-step we will build.
-* `last_temp` a read-only view of the temperature at the previous time-step.Note that *span_cview* returns a read-only ChunkSpan.
-
-\snippet{trimleft} uniform_heat_equation.cpp manipulated views
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-We then solve the equation.
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-\snippet{trimleft} uniform_heat_equation.cpp numerical scheme
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 ## Time loop
 
 \snippet{trimleft} uniform_heat_equation.cpp time iteration
 
 ### Periodic conditions
 
-\snippet{trimleft} uniform_heat_equation.cpp output
-
 \snippet{trimleft} uniform_heat_equation.cpp boundary conditions
 
 ### Numerical scheme
@@ -221,6 +192,4 @@ For the numerical scheme, two chunkspans are created:
 
 We then solve the equation.
 
-\snippet{trimleft} uniform_heat_equation.cpp final output
-
 \snippet{trimleft} uniform_heat_equation.cpp numerical scheme