🤟 Webiny New UI Library Research, POC and Selection

[m0nikaza]

We have made a decision to refactor the look and feel of our Admin app and redesign the most common user journeys, offering quicker, more intuitive, and more beautiful application to our users so we started with researching our options in this quarter.

The current UI package utilizes the RMWC package, which offers a collection of React components adhering to Google's Material Design guidelines. We have done thorough research on the advantages and disadvantages of various libraries, and we have picked Shadcn & Tailwind.

Shadcn delegates to Tailwind CSS for styling and [theme customisation](https://tailwindcss.com/docs/theme). Tailwind CSS provides extensive theme customization capabilities through the tailwind.config.js configuration file.