Deleting empty documentation pages

ecological_assessment/doc/content/additional.md

-# Additional information {#additional}

ecological_assessment/doc/content/tutorial.md

-# Tutorials
-@note The idea would be to explain here how developer can extend e.g. for a new strategies and/or new methods within the standard strategy.
-
-E.g.
-- @subpage tutorial_new_strategy
-- @subpage tutorial_new_method_in_standard_strategy
\ No newline at end of file

ecological_assessment/doc/content/tutorial_method_extension.md

-# Tutorial standard strategy extension {#tutorial_new_method_in_standard_strategy}
-@note The idea is to explain how the standard strategy can be extended by a new method
\ No newline at end of file

ecological_assessment/doc/content/tutorial_strategy_extension.md

-# Tutorial strategy extension {#tutorial_new_strategy}
-Idea is to provide a step by step appraoch how to extend this module by another strategy
\ No newline at end of file

propulsion_design/doc/content/additional.md

-# Additional information {#additional}
-Here, you can find additional documentation on specific comments on the code:
-- @subpage propulsion
-- @subpage technology_factors_mass
\ No newline at end of file

propulsion_design/doc/content/tutorial.md

-# Tutorials
-@note The idea would be to explain here how developer can extend e.g. for a new fidelity and/or a new engine type.
-
-E.g.
-- @subpage tutorial_fidelity_extension
-- @subpage tutorial_engine_extension
\ No newline at end of file

propulsion_design/doc/content/tutorial_engine_extension.md

-# Tutorial engine extension {#tutorial_engine_extension}
-@note The idea is explain e.g. what an engine deck is (is just shortly mentioned in on main page), how to create an engine deck in Gasturb or research an empirical estimation of a new engine type
\ No newline at end of file

propulsion_design/doc/content/tutorial_fidelity_extension.md

-# Tutorial fidelity extension {#tutorial_fidelity_extension}
-Idea is to provide a step by step appraoch how to extend this model by another fidelity
\ No newline at end of file