dependabot.yml: check npm packages

.github/dependabot.yml

@@ -8,3 +8,17 @@ updates:
       day: "friday"
     open-pull-requests-limit: 5
     target-branch: "master"
+  - package-ecosystem: "npm"
+    directory: "/searx/static/themes/oscar"
+    schedule:
+      interval: "weekly"
+      day: "friday"
+    open-pull-requests-limit: 5
+    target-branch: "master"
+  - package-ecosystem: "npm"
+    directory: "/searx/static/themes/simple"
+    schedule:
+      interval: "weekly"
+      day: "friday"
+    open-pull-requests-limit: 5
+    target-branch: "master"