* BREAKING CHANGE: refactor with Dart Sass (supplement to #741)
* chore: update .gitignore to include .vercel and .env*.local
* CI: add build script for Hugo site deployment on Vercel
* CI: update build script for Hugo site deployment on Vercel
* refactor: update SCSS layout styles and introduce page-style mixin
* refactor: reorganize SCSS files and improve layout structure
* refactor: rename copy button classes and update related styles
* feat(markup): add toggle code block functionality with multiple format support
* fix(assets): improve filename generation for code downloads
* feat(code): add `before_tabs` attribute support for tabbed code blocks
* feat(code): implement visibility control for first tab content in code blocks
* chore: use monorepo to manage demo, test and other applications and internal packages
* style: add eslint support and lint code
* chore: refactor project structure and add versioning package replace of fixit-releaser
* chore(deps-dev): replace husky with simple-git-hooks
* Potential fix for code scanning alert no. 13: Shell command built from environment values
* chore(deps-dev): update the final fixit-releaser version
* docs: update contributing guidelines for new structure and commands
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