Added new pages + new nav and file structure to be compatible with multi language

docs/en/beamng/dev/content/maps.md

@@ -0,0 +1,19 @@
+!!! warning "This site is under construction!"
+
+    This site is being actively worked on. 
+    
+    Feel you could help? Please do by clicking on the page with a pencil on the right!
+
+    This can be done any page too.
+
+# BeamNG.drive Map Creation
+
+...
+
+## Introduction
+
+...
+
+## Getting Started
+
+...

docs/en/beamng/dev/content/props.md

@@ -0,0 +1,19 @@
+!!! warning "This site is under construction!"
+
+    This site is being actively worked on. 
+    
+    Feel you could help? Please do by clicking on the page with a pencil on the right!
+
+    This can be done any page too.
+
+# BeamNG.drive Prop Creation
+
+...
+
+## Introduction
+
+...
+
+## Getting Started
+
+...

docs/en/beamng/dev/content/vehicles.md

@@ -0,0 +1,19 @@
+!!! warning "This site is under construction!"
+
+    This site is being actively worked on. 
+    
+    Feel you could help? Please do by clicking on the page with a pencil on the right!
+
+    This can be done any page too.
+
+# BeamNG.drive Vehicle Creation
+
+...
+
+## Introduction
+
+...
+
+## Getting Started
+
+...

docs/en/beamng/dev/index.md

@@ -0,0 +1,9 @@
+!!! warning "This site is under construction!"
+
+    This site is being actively worked on. 
+    
+    Feel you could help? Please do by clicking on the page with a pencil on the right!
+
+    This can be done any page too.
+
+# BeamNG.drive Development Introduction

docs/en/beamng/dev/modding/imgui-windows.md

@@ -0,0 +1,2 @@
+# imgui-windows.md
+This page needs creating

docs/en/beamng/dev/modding/lua-mods.md

@@ -0,0 +1,2 @@
+# lua-mods.md
+This page needs creating

docs/en/beamng/dev/modding/ui-apps.md

@@ -0,0 +1 @@
+# UI-App Creation