Add DARPA drone and Onshape tutorials (#234)

Adds new DARPA drone and Onshape tutorials with integrated image assets. Standardizes navigation.yml by fixing malformed YAML syntax and sanitizing URL paths (removed .md extensions and ensured trailing slashes). Updated category indices to include new content.

Author: GwenethGe

_data/navigation.yml

@@ -62,6 +62,8 @@ wiki:
     children:
       - title: DJI Breakdown for Technical Projects
         url: /wiki/common-platforms/dji-drone-breakdown-for-technical-projects/
+      - title: Building a Custom Drone for the DARPA Triage Challenge
+        url: /wiki/common-platforms/building-custom-drone-for-darpa-triage-challenge/
       - title: DJI SDK
         url: /wiki/common-platforms/dji-sdk/
       - title: Unitree Go1
@@ -132,15 +134,15 @@ wiki:
       - title: Intel Realsense
         url: /wiki/sensing/realsense/
       - title: Robotic Total Station (Leica TS16)
-        url: /wiki/sensing/robotic-total-stations.md
+        url: /wiki/sensing/robotic-total-stations/
       - title: Thermal Cameras
         url: /wiki/sensing/thermal-cameras/
       - title: Azure Block Detection
         url: /wiki/sensing/azure-block-detection/
       - title: DWM1001 UltraWideband Positioning System
-        url: /wiki/sensing/ultrawideband-beacon-positioning.md
+        url: /wiki/sensing/ultrawideband-beacon-positioning/
       - title: Reducing Sensor Noise in Thermal or Visual Imaging sensors
-        url: /wiki/sensing/sensor-noise.md
+        url: /wiki/sensing/sensor-noise/
   - title: Controls & Actuation
     url: /wiki/actuation/
     children:
@@ -155,9 +157,9 @@ wiki:
       - title: Vedder Electronic Speed Controller
         url: /wiki/actuation/vedder-electronic-speed-controller/
       - title: Pure Pursuit Controller for Skid Steering
-        url: /wiki/actuation/Pure-Pursuit-Controller-for-Skid-Steering-Robot.md
+        url: /wiki/actuation/Pure-Pursuit-Controller-for-Skid-Steering-Robot/
       - title: MoveIt Motion Planning and HEBI Actuator Setup and Integration
-        url: /wiki/actuation/moveit-and-HEBI-integration.md
+        url: /wiki/actuation/moveit-and-HEBI-integration/
       - title: Model Predictive Control Introduction and Setup
         url: /wiki/actuation/model-predictive-control/
       - title: Task Prioritization Control for Advanced Manipulator Control
@@ -174,15 +176,15 @@ wiki:
       - title: Python libraries for Reinforcement Learning
         url: /wiki/machine-learning/python-libraries-for-reinforcement-learning/
       - title: Reinforcement Learning
-        url: /wiki/machine-learning/intro-to-rl
+        url: /wiki/machine-learning/intro-to-rl/
       - title: YOLO Integration with ROS and Running with CUDA GPU
         url: /wiki/sensing/ros-yolo-gpu/
       - title: YOLOv5 Training and Deployment on NVIDIA Jetson Platforms
         url: /wiki/machine-learning/yolov5-tensorrt/
       - title: Mediapipe - Live ML anywhere
-        url: /wiki/machine-learning/mediapipe-live-ml-anywhere.md/
+        url: /wiki/machine-learning/mediapipe-live-ml-anywhere/
       - title: NLP for robotics
-        url: /wiki/machine-learning/nlp_for_robotics.md/
+        url: /wiki/machine-learning/nlp_for_robotics/
   - title: State Estimation
     url: /wiki/state-estimation/
     children:
@@ -199,7 +201,7 @@ wiki:
       - title: Cartographer SLAM ROS Integration
         url: /wiki/state-estimation/Cartographer-ROS-Integration/
       - title: Externally Referenced State Estimation for GPS Lacking Environments
-        url: /wiki/state-estimation/gps-lacking-state-estimation-sensors.md
+        url: /wiki/state-estimation/gps-lacking-state-estimation-sensors/
   - title: Programming
     url:  /wiki/programming/
     children:
@@ -260,13 +262,13 @@ wiki:
     url: /wiki/computing/
     children:
       - title: Amazon Web Services Quickstart
-        url: wiki/computing/aws-quickstart.md
+        url: /wiki/computing/aws-quickstart/
       - title: Adruino
         url: /wiki/computing/arduino/
       - title: Single Board Computers
         url: /wiki/computing/single-board-computers/
       - title: Upgrading Ubuntu Kernels
-        url: /wiki/computing/upgrading-ubuntu-kenel/
+        url: /wiki/computing/upgrading-ubuntu-kernel/
       - title: Ubuntu 14.04 on Chromebook
         url: /wiki/computing/ubuntu-chromebook/
       - title: Setup your GPU System for Computer Vision
@@ -298,6 +300,8 @@ wiki:
         url: /wiki/fabrication/cube-pro/
       - title: Series A Pro Printer
         url: /wiki/fabrication/series-A-pro/
+      - title: Onshape Tutorial
+        url: /wiki/fabrication/onshape-tutorial/
   - title: Math
     url: /wiki/math/
     children:
@@ -348,9 +352,9 @@ wiki:
     url: /wiki/datasets/
     children:
       - title: Traffic Modelling Datasets
-      - url: /wiki/datasets/traffic-modelling-datasets/
+        url: /wiki/datasets/traffic-modelling-datasets/
       - title: Open-Source Datasets
-      - url: /wiki/datasets/open-source-datasets/
+        url: /wiki/datasets/open-source-datasets/
   - title: Planning
     url: /wiki/planning/
     children:
@@ -365,7 +369,7 @@ wiki:
       - title: Multi Robot Planning Design
         url: /wiki/planning/multi-robot-planning/
       - title: Motion Planning in frenet frame
-        url: /wiki/planning/frenet-frame-planning.md/
+        url: /wiki/planning/frenet-frame-planning/
       - title: Move Base Flex
         url: /wiki/planning/move-base-flex/
 # Main links appear in the header.