teams(ngi): update team members list

- Remove Julien Malka

Author: wamirez

core/src/content/teams/160_ngi.mdx

@@ -7,12 +7,10 @@ members:
     title: Team Lead
   - name: Daniel Ramirez
     discourse: wamirez
-    title: Admin Assistant
+    title: Admin. Assistant
   - name: Fedi Jamoussi
     discourse: eljamm
     title: Core Developer
-  - name: Julien Malka
-    discourse: JulienMalka
   - name: OPNA2608
     discourse: OPNA2608
   - name: Kerstin Humm