Description

There are new devtools doing the same job as old once but 20 times faster and/or friendlier/easier. We do not want to lag behind the cutting edge, so why not try those new tools?

Goals

• Replace prettier + eslint by fantastic biome
• Upgrade TS to version 5 and enjoy new API and features
• Upgrade tailwind to version 4 and enjoy simplified API for extending tailwind's utilities and using CSS-variables