Add weekly NPM automation

.github/scripts/update-npm.sh

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+#!/usr/bin/env bash
+# Enable strict error checking
+set -euo pipefail
+
+# Install ncu
+npm i -g npm-check-updates
+pushd dependencies
+
+# Update all dependencies
+ncu -u
+npm install
+
+# Use NPM audit to force fix html-lint issue
+npm audit fix --force
+npm install
+
+# Use ncu to force fix NPM audit issue
+ncu -u
+npm install
+popd
+
+# Push changes to remote
+git add .
+git commit -a -Ss -m "Update NPM dependencies"
+git checkout -b "npm_deps_${id}"
+git push origin "npm_deps_${id}"
+
+# Open pull request
+gh pr create --title "Weekly NPM Updates" --body "Updates NPM dependencies" --base master --head "npm_deps_${id}"

.github/workflows/deps-npm.yml

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+name: Update Deps - NPM
+on:
+  schedule:
+    # Sunday at 5:00pm
+    - cron: "0 17 * * 0"
+  workflow_dispatch:
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Update NPM
+        uses: actions/npm-update@v1
+      - run: ./github/scripts/update-npm.sh
+        env:
+          id: ${{ github.run_id }}