docs: update simulation

docs/simulation/intro.rst

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+###################
+Simulating Networks
+###################
+
+The BSB offers adapters that enable you to simulate
+your network using widely-used neural simulation software. Consequently, once the model is created,
+it can be simulated across different software platforms without requiring modifications or adjustments.
+Currently, adapters are available for NEST, NEURON, and ARBOR,
+although support for ARBOR is not yet fully developed.
+
+All simulation details are specified within the simulation block, which includes:
+ * a ``simulator`` : the software chosen for the simulations.
+ * set of ``cell models`` : the simulator specific representations of the network's :doc:`CellTypes </cells/intro>`
+ * set of ``connection models`` :  that instruct the simulator on how to handle the :doc:`ConnectivityStrategies </connectivity/defining>` of the network
+ * set of ``devices`` : define the experimental setup (such as input stimuli and recorders).
+
+All of the above is simulation backend specific and is covered in the specific sections:
+
+ * :doc:`NEST </simulation/nest>`.
+ * :doc:`NEURON </simulation/neuron>`.
+ * :doc:`ARBOR </simulation/arbor>`.
+
+Running Simulations
+-------------------
+
+Simulations can be run through the CLI or through the ``bsb`` library for more
+control:
+
+.. tab-set-code::
+
+    .. code-block:: bash
+
+      bsb simulate my_network.hdf5 my_sim_name
+
+    .. code-block:: python
+
+        from bsb import from_storage
+        network = from_storage("my_network.hdf5")
+        network.run_simulation("my_sim")
+
+When using the CLI, the framework sets up a "hands off" simulation workflow:
+
+* Read the network file
+* Read the simulation configuration
+* Translate the simulation configuration to the simulator
+* Create all cells, connections and devices
+* Run the simulation
+* Collect all the output
+
+When you use the library, you can set up more complex workflows, such as parameter sweeps:
+
+.. literalinclude:: ../../examples/simulation/parameter_sweep.py
+  :language: python
+
+.. rubric:: Parallel simulations
+
+To parallelize any BSB task prepend the MPI command in front of the BSB CLI command, or
+the Python script command:
+
+.. code-block:: bash
+
+  mpirun -n 4 bsb simulate my_network.hdf5 my_sim_name
+  mpirun -n 4 python my_simulation_script.py
+
+Where ``n`` is the number of parallel nodes you'd like to use.
+

docs/simulation/nest.rst

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+###################
+Simulate using NEST
+###################
+
+