Major feat(Documentation): Complete documentation rework

Split documentation into three folders: Architecture, Testing and
Installation.

Rework and expand architecture.md alongside interfaces.md

Split all parts to do with testing from Architecture md's into Test md's

Add parameter to ExamResultGenerator node documentation

doc/architecture/nodes/GradeCalculator.md

@@ -0,0 +1,25 @@
+# GradeCalculator (`assignments::one::grade_calculator::GradeCalculator`)
+
+## Overview
+The `GradeCalculator` node provides a ROS2 service for calculating student exam grades. It processes exam scores, applies custom logic for specific student names, and ensures grade results are within valid bounds.
+
+#### Implementation Details
+
+**Constructor**
+```cpp
+GradeCalculator()
+```
+- Initializes ROS2 node with name `grade_calculator`
+- Creates a ROS2 service server for `grade_calculator_service`
+- Binds the service callback to handle grade calculation requests
+- Logs service startup
+
+**Core Functions**
+
+**`void grade_calculator_callback(const Exams::Request::SharedPtr request, const Exams::Response::SharedPtr response)`**
+- Checks if exam grades are provided
+- Calculates the total and average of exam grades
+- Converts student name to lowercase for comparison
+- Adds a bonus of 10 points if the student name is "wessel"
+- Ensures the final grade is clamped between 10 and 100
+- Sends the calculated grade back through the service response