Update _sidebar.md

Author: HybridsEgo

docs/_sidebar.md

@@ -1,9 +1,24 @@
-- [Halo The Master Chief Collection](#halo-the-master-chief-collection)
-- [Halo Infinite](#halo-infinite)
+- Modern
+ 
+  - [Halo The Master Chief Collection](#halo-the-master-chief-collection)
+  - [Halo Infinite](#halo-infinite)
+  - [Halo Wars 2]()
+  - [Halo Fireteam Raven]()
 
-- Xbox 360
+- Legacy
+  
+  - Xbox 360
+    
+    - [Halo: Reach](#halo-reach)
+    - [Halo 3](#halo-3)
+    - [Halo 3 ODST](#halo-3-odst)
+    - [Halo 4](#halo-4)
+    - [Halo Wars]()
+  
+  - Xbox
+    - [Halo CE]()
+    - [Halo 2]()
 
-  - [Halo: Reach](#halo-reach)
-  - [Halo 3](#halo-3)
-  - [Halo 3 ODST](#halo-3-odst)
-  - [Halo 4](#halo-4)
+  - Other
+    - [Halo Online]()
+    - [Halo 2 Vista]()