teams.marketing: remove Thomas Bereknyei (#1863)

Removing as requested.

Ping @tomberek

Author: djacu

core/src/content/teams/080_marketing.mdx

@@ -11,9 +11,6 @@ members:
   - name: Florian Pester
     discourse: flyfloh
     title: Social Media Liaison
-  - name: Thomas Bereknyei
-    discourse: tomberek
-    title:
 contact:
   - name: Discourse
     href: https://discourse.nixos.org/c/dev/marketing-team/28