GitLab

This PR include:

• Videos responsive capability
• GitLab CI improvements
  • Remove node_modules artifacts
  • Use global cache
  • Use environment
• Upgrade Node.js version in nvmrc
• Update docs and fix typos
• Styles improvement
  • Replace static colors with variables
  • Fix ms-Fabric text color compatibility
  • Fix primary button behavior in responsive mode
  • Support responsive videos
  • Fix full-width image for very large screen
• JavaScript
  • Responsive videos
  • Catch 'enter' keyboard event from the search bar to avoid page reload
• Ghost v4
  • Update GhostHunter API version by default
  • package.json
  • gulp.js use package.json API version
  • handlebars attributes for v4
• Dev env
  • Max upload file size
  • Docker compose
• Package
  • Update dev dependencies version