remove old advanced simulation doc page

Author: TorkelE

docs/pages.jl

@@ -27,7 +27,7 @@ pages = Any[
         # Simulation introduction.
         # Simulation plotting.
         "model_simulation/simulation_structure_interfacing.md",
-        # Monte Carlo/Ensemble simulations.
+        "model_simulation/ensemble_simulations.md",
         # Stochastic simulation statistical analysis.
         # ODE Performance considerations/advice.
         # SDE Performance considerations/advice.