Docs with all examples need loooooooong time

[navidcy]

At the moment it takes round ~6hrs or so.

Ideas?

Should we make the one-degree example shorter? 3 months?

[navidcy]

Change this to

NumericalEarth.jl/examples/one_degree_simulation.jl

Line 117 in bc97fb0

simulation = Simulation(coupled_model; Δt=20minutes, stop_time=365days)

stop_time = 90days?