Kind of duplicate with higher order presentation by Normann.

Hence remove the example with manual computation.

This can be confusing to users, since this block is for the numerical solver,
while “steady_state_model” is for an analytical steady state.

For consistency with other slides.

Also mention that it works with both temporary and permanent shocks.

– add slide and example about perfect_foresight_with_expectation_errors_{setup,solver} syntax
– expand slides on EP and SEP (borrowing some stuff from Stéphane’s slides)
– switch to 16:9 ratio