Narrow dotcom-platform In CODEOWNERS (#13734)

When a person or team is marked as a code owner for an area of the
codebase, they are automatically requested for review whenever a PR
modifies that area. At the moment, dotcom-platform is marked as a code
owner for almost the entire codebase. This means that they receive a
review request for essentially every PR that's opened.

This change alters the dotcom-platform team's entry in the CODEOWNERS
file to target specific areas of the codebase. Note that this does not
prevent PR authors from requesting reviews from dotcom-platform, or
anyone else, as needed. It just narrows the list of PRs for which the
team is asked for review automatically.

Also specifies Commercial as the owners of some files.

Co-authored-by: Ravi <[email protected]>

Author: JamieB-gu

.github/CODEOWNERS

@@ -1,8 +1,27 @@
 # This file is matched from top down; subsequent matches override previous matches.
 # https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
 
-# By default all files are owned by these teams:
-* 												@guardian/dotcom-platform
+# Files at the root of the project
+/*                                              @guardian/dotcom-platform
 
-/dotcom-rendering/src/components/marketing/ 	@guardian/growth
-/dotcom-rendering/src/client/userFeatures/ 		@guardian/supporter-revenue-stream
+/.github/                                       @guardian/dotcom-platform
+/.husky/                                        @guardian/dotcom-platform
+/.vscode/                                       @guardian/dotcom-platform
+/apps-rendering/                                @guardian/dotcom-platform
+
+# Files at the root of `/dotcom-rendering`
+/dotcom-rendering/*                             @guardian/dotcom-platform
+
+/dotcom-rendering/.storybook/                   @guardian/dotcom-platform
+/dotcom-rendering/cdk/                          @guardian/dotcom-platform
+/dotcom-rendering/configs/                      @guardian/dotcom-platform
+/dotcom-rendering/scripts/                      @guardian/dotcom-platform
+/dotcom-rendering/src/client/islands/           @guardian/dotcom-platform
+/dotcom-rendering/src/client/userFeatures/      @guardian/supporter-revenue-stream
+/dotcom-rendering/src/components/AdBlock*       @guardian/commercial-dev
+/dotcom-rendering/src/components/AdSlot*        @guardian/commercial-dev
+/dotcom-rendering/src/components/AdP*           @guardian/commercial-dev
+/dotcom-rendering/src/components/marketing/     @guardian/growth
+/dotcom-rendering/src/server/                   @guardian/dotcom-platform
+/dotcom-rendering/webpack/                      @guardian/dotcom-platform
+/scripts/                                       @guardian/dotcom-platform