[Docs] Updating screenshots comparing Stride to Unity

The screenshot of the Unity UI is a non-standard Unity UI and does not resemble the default Unity UI nor any UI that I have ever encountered in my professional career in Unity.

Taking my own screenshot using Unity's Default layout, which is much more common.

Updated the style of the screenshots to work better across both light and dark theme. Made the screenshots seperate images for a better user experience.

en/manual/stride-for-unity-developers/index.md

@@ -8,9 +8,9 @@ Stride and Unity® both use C# and share many concepts, with a few major differe
 
 The Stride editor is **Game Studio**. This is the equivalent of the Unity® Editor.
 
-![Stride and Unity®  interface comparison](media/stride-vs-unity-interface-comparison.png)
+![Unity® Editor layout](media/stride-vs-unity-unitylayout.png)
 
-*Unity® screenshot taken from [Calling a web-service from a Unity3D scene](http://through-the-interface.typepad.com/through_the_interface/2012/04/calling-a-web-service-from-a-unity3d-scene.html) by Kean Walmsley.*
+![Stride Game Studio layout](media/stride-vs-unity-stridelayout.png)
 
 You can customize the Game Studio layout by dragging tabs, similar to Visual Studio.
 

en/manual/stride-for-unity-developers/media/stride-vs-unity-interface-comparison.png

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:bfce3d618e18e030ab7c191e605c017a11ca84b81bf958d01ab68a03b9f5f141
-size 518009

en/manual/stride-for-unity-developers/media/stride-vs-unity-stridelayout.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b151c9ddf4a3d07a5655b052cfdadffaa3b7f1fd5fede92824d48a9886e35671
+size 574898

en/manual/stride-for-unity-developers/media/stride-vs-unity-unitylayout.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fd4b8f316a4955c3f59c3192a11b87abb67cac44f7d9040bd46b1ce5faab25ce
+size 374472