Tailwind CSS 4 Migration (#100)

* Updated to TailwindCSS v4
* Moved CSS module to its own CSS file because of lightingcss strict validation
* Respect next parameter in middleware
* Updated all packages. 
* Split CSSs for better organization.
* Redesigned theme and auth pages
* Improved pill and header design
* Formatted files using Prettier
* Better footer layout
* Better auth layout
* Bump version of the repository to 2.0.0

apps/web/app/(marketing)/docs/page.tsx

@@ -21,7 +21,7 @@ async function DocsPage() {
   const cards = items.filter((item) => !item.parentId);
 
   return (
-    <div className={'flex flex-col space-y-6 xl:space-y-10'}>
+    <div className={'flex flex-col gap-y-6 xl:gap-y-10'}>
       <SitePageHeader
         title={t('marketing:documentation')}
         subtitle={t('marketing:documentationSubtitle')}