React implementation of Preline UI (https://preline.io)

• https://preline-react.vercel.app
• https://preline.binfoe.com （for China's mainland）

• https://github.com/binfoe/preline-react-demo-site

• transition/transition-group for tailwindcss, see src/transition and usage in Toast, Modal and Tooltip components.
• better z-index management, see src/util/zindex.ts and demo usage