Updates ecological assessment documentation

Description

Updates on the documentation of ecological_assessment:

• changes to native markdown
• improved structure
• more method explanations

Additional Notes

• The citation is currently not working - I try to fix this in another MR
• Some functions in Dallara basic concept are not displayed correctly - I'm thankful for ideas how to fix that

docs/documentation/analysis/ecological_assessment/software-architecture.md

@@ -2,5 +2,19 @@
 
 At the highest level, the `main_ecological_assessment.cpp` calls the function `execute()` of the class `EcologicalAssessment`, which inherits from the class `Module` (available in the library **moduleBasics**). `EcologicalAssessment` provides access to defined strategies. It will run the functions `initialize`, `run`, `update`, `report` and `save` of the strategy (inherited from the `Module` class in **moduleBasics**). Additionally, the `save` function will save and close the aircraft XML file, as well as close the configuration file.
 
-Currently, only one strategy (called STANDARD) is implemented. Here you can find more information about it: @subpage standard-strategy
 
+If you're interested in developing this module, reading this chapter could be helpful. It provides some insights into the software structure and shall help you to find a way around :flashlight:
+
+As you have for sure carefully read our (developer guide)[https://unicado.pages.rwth-aachen.de/unicado.gitlab.io/get-involved/developer-installation/], you already know everything about the modularized structure of the UNICADO and the top, intermediate and low level of its modules. So, here is how the *ecological_assessment* tool looks like:
+
+- On the top level, nothing fancy happens. Within the src directory, you will find the `main_ecological_assessment.cpp` which executes the module and the `ecolocical_assessment.cpp`/`ecolocical_assessment.h`, where the class EcologicalAssessment, which is inherited from the class Module, is defined. Therefor, it will run the functions `initialize`, `run`, `update`, `report` and `save` of the strategy. The save function will save and close the aircraft XML file and close the configuration file. In the class definition, you the RuntimeIO pointer is
+
+- The intermediate level is structured by the implemented strategies.
+
+- On the low level, you'll find all in (basic concepts)[basic-concepts.md] described methods. The folder structure is like the module structure. So the *standard_strategy* is subdivided into *emission_calculation* and *impact_calulation*.
+
+All submodules have a class _IOData_, which contains all data from acXML and functions to read or write the data. Additionally, it has a member _configuration_, which provides access to configuration file data. The submodules are executed via the function `run`, which is called by the `StandardStrategy`. The `run` function shall call functions to
+
+    - initialize the data,
+    - perform the calculation routines
+    - and update the `ecological_assessment_results.xml` (in case there are results that are needed by other parts of *ecological_assessment*).