Dark theme for new tab page

Turn on dark theme on new tab. Enable night mode on browser home page.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "description": "__MSG_app_description__",
  "version": "7.0.0",
  "manifest_version": 3,
  "default_locale": "en",
  "name": "__MSG_app_name__",
  "icons": {
    "16": "public/icons/dr_16.png",
    "48": "public/icons/dr_48.png",
    "128": "public/icons/dr_128.png"
  },
  "chrome_url_overrides": {
    "newtab": "/newtab.html"
  }
}