{
  "name": "jan-aagaards-blog",
  "version": "1.0.0",
  "description": "Jan Aagaard's Blog",
  "main": "index.html",
  "repository": "https://github.com/janaagaard75/janaagaard75.github.io.git",
  "author": "Jan Aagaard <jan@aagaard.net>",
  "license": "MIT",
  "private": true,
  "dependencies": {
    "bootstrap": "4.3.1"
  },
  "scripts": {
    "clean": "rm -rf _site",
    "install-ruby-gems": "bundle install",
    "start": "yarn run clean && bundle exec jekyll serve --future --unpublished",
    "update-ruby-gems": "bundle update"
  }
}

{
  "name": "jan-aagaards-blog",
  "version": "1.0.0",
  "description": "Jan Aagaard's Blog",
  "main": "index.html",
  "repository": "https://github.com/janaagaard75/janaagaard75.github.io.git",
  "author": "Jan Aagaard <jan@aagaard.net>",
  "license": "MIT",
  "private": true,
  "dependencies": {
    "bootstrap": "4.3.1"
  },
  "scripts": {
    "clean": "rm -rf _site",
    "install-ruby-bundler": "gem install bundler",
    "install-ruby-gems": "bundle install",
    "start": "yarn run clean && bundle exec jekyll serve --future --unpublished",
    "update-ruby-gems": "bundle update"
  }
}

Add command for installing Bundler
Add command for installing Bundler
