Misc.: Remove Team Calypso from CODEOWNERS (#43764)

To start off this work I'm just removing us completely from
CODEOWNERS. We can discuss the actual appropriate scope for
our team in the PR and update it as we make decisions about
what is actually important for us to get notifications for.

.github/CODEOWNERS

@@ -9,32 +9,12 @@
 #
 # See https://help.github.com/en/articles/about-code-owners for details on the format of this file
 
-# Root level files and configuration
-/*.* @Automattic/team-calypso
-
-# Scripts
-/bin @Automattic/team-calypso
-
-# Client initialization
-/client/boot @Automattic/team-calypso
-
-# Client framework parts
-/client/config @Automattic/team-calypso
-/client/controller @Automattic/team-calypso
-/client/document @Automattic/team-calypso
-/client/layout @Automattic/team-calypso
-
 # Comments management
 /client/my-sites/comment* @Automattic/serenity
 
 # Customer Home
 /client/my-sites/customer-home @Automattic/manage
 
-# Developer guides
-/docs/coding-guidelines @Automattic/team-calypso
-/docs/guide @Automattic/team-calypso
-/docs/testing @Automattic/team-calypso
-
 # G Suite
 /client/components/data/query-gsuite-users @Automattic/cobalt
 /client/components/domains/contact-details-form-fields/index.jsx @Automattic/cobalt
@@ -92,12 +72,6 @@
 /client/blocks/reader-* @Automattic/reader
 /client/state/reader @Automattic/reader
 
-# Server infrastructure
-/server @Automattic/team-calypso
-
-# Test infrastructure
-/test @Automattic/team-calypso
-
 # Types, TypeScript, and type annotations
 /client/types.ts @Automattic/type-review
 /docs/coding-guidelines/typescript* @Automattic/type-review