chore: remove teams without write access from CODEOWNERS (#22043)

* chore: update CODEOWNERS for Ecosystem WG

* chore: remove teams w/o write access from CODEOWNERS

.github/CODEOWNERS

@@ -3,20 +3,10 @@
 # https://help.github.com/articles/about-codeowners
 # https://git-scm.com/docs/gitignore
 
-# Most stuff in here is owned by the Community & Safety WG...
-/.github/*                              @electron/wg-community
-
-# ...except the Admin WG maintains this file.
-/.github/CODEOWNERS                     @electron/wg-admin
-
 # Upgrades WG
 /patches/                               @electron/wg-upgrades
 DEPS                                    @electron/wg-upgrades
 
-# Docs & Tooling WG
-/default_app/ @electron/wg-docs-tools
-/docs/                                  @electron/wg-docs-tools
-
 # Releases WG
 /npm/                                   @electron/wg-releases
 /script/release                         @electron/wg-releases