Docs/lh coord system diagram (#8282)

* added Unreal Engine lhcs diagram

* changed to <img> tag

* replaced with github link

Docs/python_api.md

@@ -1998,7 +1998,7 @@ Iterate over the [carla.RadarDetection](#carla.RadarDetection) retrieved as data
 ---
 
 ## carla.Rotation<a name="carla.Rotation"></a>
-Class that represents a 3D rotation and therefore, an orientation in space. CARLA uses the Unreal Engine coordinates system. This is a Z-up left-handed system.  <br> <br> The constructor method follows a specific order of declaration: `(pitch, yaw, roll)`, which corresponds to `(Y-rotation,Z-rotation,X-rotation)`. <br> <img src="/img/unreal_lhcs.png" width="100%"> *Unreal Engine's left handed coordinate system with rotations*.  
+Class that represents a 3D rotation and therefore, an orientation in space. CARLA uses the Unreal Engine coordinates system. This is a Z-up left-handed system.  <br> <br> The constructor method follows a specific order of declaration: `(pitch, yaw, roll)`, which corresponds to `(Y-rotation,Z-rotation,X-rotation)`. <br> <img src="https://github.com/carla-simulator/carla/blob/ue4-dev/Docs/img/unreal_lhcs.png?raw=true" width="100%"> *Unreal Engine's left handed coordinate system with rotations*.  
 
 ### Instance Variables
 - <a name="carla.Rotation.pitch"></a>**<font color="#f8805a">pitch</font>** (_float<small> - degrees</small>_)  

PythonAPI/docs/geom.yml

@@ -330,7 +330,7 @@
       <br>
       The constructor method follows a specific order of declaration: `(pitch, yaw, roll)`, which corresponds to `(Y-rotation,Z-rotation,X-rotation)`.
       <br>
-      <img src="/img/unreal_lhcs.png" width="100%">
+      <img src="https://github.com/carla-simulator/carla/blob/ue4-dev/Docs/img/unreal_lhcs.png?raw=true" width="100%">
       *Unreal Engine's left handed coordinate system with rotations*
     # - PROPERTIES -------------------------
     instance_variables: