Add renovate and prettier configs to nodejs templates (#160)

Author: JustinBeckwith

synthtool/gcp/templates/node_library/.prettierignore

@@ -0,0 +1,3 @@
+node_modules/*
+samples/node_modules/*
+src/**/doc/*

synthtool/gcp/templates/node_library/.prettierrc

@@ -0,0 +1,8 @@
+---
+bracketSpacing: false
+printWidth: 80
+semi: true
+singleQuote: true
+tabWidth: 2
+trailingComma: es5
+useTabs: false

synthtool/gcp/templates/node_library/renovate.json

@@ -0,0 +1,18 @@
+{
+  "extends": [
+    "config:base",
+    "docker:disable"
+  ],
+  "pinVersions": false,
+  "rebaseStalePrs": true,
+  "schedule": [
+    "after 9am and before 3pm"
+  ],
+  "gitAuthor": null,
+  "packageRules": [
+    {
+      "extends": "packages:linters",
+      "groupName": "linters"
+    }
+  ]
+}