Fix renovate config (#119)

Current config does not include grouping for npm packages, seemingly by mistake (it includes nuget, which is not used in this repo). This fixes that.

Author: Tyrrrz

renovate.json

@@ -1,15 +1,18 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["github>bitwarden/renovate-config"],
-  "enabledManagers": ["github-actions", "nuget"],
-  "commitMessagePrefix": "[deps]:",
-  "commitMessageTopic": "{{depName}}",
+  "enabledManagers": ["github-actions", "npm", "nuget"],
   "packageRules": [
     {
       "groupName": "gh minor",
       "matchManagers": ["github-actions"],
       "matchUpdateTypes": ["minor", "patch"]
     },
+    {
+      "groupName": "npm minor",
+      "matchManagers": ["npm"],
+      "matchUpdateTypes": ["minor", "patch"]
+    },
     {
       "groupName": "nuget minor",
       "matchManagers": ["nuget"],