chore: scope Dependabot to only packages we control

The previous config monitored all npm dependencies in the monorepo root,
which includes ~20 forked @react-native/* packages whose dependencies
should stay in sync via upstream merges — not Dependabot.

Now Dependabot only monitors:
- /docsite (own lockfile, docusaurus deps)
- /packages/react-native (react-native-macos)
- /packages/react-native-macos-init
- /packages/nx-release-version
- /packages/virtualized-lists

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Saadnajmi

.github/dependabot.yml

@@ -1,17 +1,25 @@
-# Basic `dependabot.yml` file with
-# minimum configuration for three package managers
-
 version: 2
 updates:
   - package-ecosystem: "npm"
-    directory: "/"
+    directory: "/docsite"
     schedule:
       interval: "weekly"
     groups:
       docusaurus:
         patterns:
           - "@docusaurus/*"
 
+  # Only monitor packages we control — forked @react-native/* packages
+  # should stay in sync via upstream merges.
+  - package-ecosystem: "npm"
+    directories:
+      - "/packages/react-native"
+      - "/packages/react-native-macos-init"
+      - "/packages/nx-release-version"
+      - "/packages/virtualized-lists"
+    schedule:
+      interval: "weekly"
+
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule: