feat: Emulsify base theme

[callinmullaney]

This PR does the following:

• Adds the Emulsify base theme
• Generates and installs an emulsify subtheme during project setup
• Removed old theme dependency emulsify_twig and installs a new, forked dependency emulsify_tools

Functional Testing:

• run composer create-project fourkitchens/sous-drupal-project:dev-emulsify-base-theme webchef --no-interaction
• Verify this command sets up a project called webchef
• Log into Drupal with the provided temporary link - The webchef project should have emulsify_tools installed, emulsify (base theme) installed and enabled from web/themes/contrib/emulsify, and generates a subtheme call webchef that is enabled as the default frontend theme.
• Verify that the theme tools (web/themes/custom/webchef/node_modules) are present
• run lando theme-watch and verify a storybook URL is provided with an empty component library - See note below
  

Note:

• The project setup above should all function but Compound isn't installed by default and currently has some compatibility issues with the recent version of sass. These are being resolved outside of this PR.