Update CONTRIBUTING.md (#3163)

CONTRIBUTING.md

@@ -19,21 +19,19 @@ This section describes governance processes we follow in developing Aim.
 
 ### Persons of Interest
 
+#### BDFL
+Role: All final decisions related to Aim.
+- Gev Soghomonyan ([SGevorg](https://github.com/SGevorg))
+
 #### Authors
 
 - Gev Soghomonyan ([SGevorg](https://github.com/SGevorg))
-- Gor Arakelyan ([gorarakelyan](https://github.com/gorarakelyan))
+- Gor Arakelyan ([gorarakelyan](https://github.com/gorarakelyan)) (no longer associated)
 
-#### Primary Maintainers
+#### Maintainers
 
 - Albert Torosyan ([alberttorosyan](https://github.com/alberttorosyan))
 - Karen Hambardzumyan ([mahnerak](https://github.com/mahnerak))
-- Ruben Karapetyan ([roubkar](https://github.com/roubkar))
-
-#### Core Contributors
-
-- Arsen Alkamyan ([arsengit](https://github.com/arsengit))
-- Karo Muradyan ([KaroMourad](https://github.com/KaroMourad))
 - Mihran Vanyan ([mihran113](https://github.com/mihran113))
 
 ### Releases