feat: add minimal Dependabot configuration

- Enable monthly dependency update checks
- Monitor GitHub Actions and npm dependencies
- Limit open PRs to avoid spam
- Ignore dev dependencies to reduce noise

Author: nickotmazgin

.github/dependabot.yml

@@ -0,0 +1,19 @@
+version: 2
+updates:
+  # Enable version updates for GitHub Actions (if any added later)
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 3
+
+  # Monitor for any npm/node dependencies (if package.json exists)  
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 2
+    ignore:
+      # Ignore development dependencies
+      - dependency-name: "*"
+        dependency-type: "development"