Core package storybook setup (#1003)

* [/][m]: add storybook to core package

* [/][s]: replace nx with nrwl packages for storybook

* [core][xs]: mv tsconfig.storybook.json to .storybook/tsconfig.json

* [/][s]: configure storybook with tailwind

* [core/tailwind.config.js][xs]: add basic Flowershow tailwind config

* [core][xs]: add example story

* [core][s]: darkmode storybook addon

packages/core/.storybook/tailwind-imports.css

@@ -0,0 +1,3 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;