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/styles/makerkit.css

@@ -0,0 +1,42 @@
+/*
+* makerkit.css
+*
+* Makerkit-specific global styles
+* Use this file to add any global styles that are specific to Makerkit's components
+ */
+
+/*
+Optimize dropdowns for mobile
+ */
+[data-radix-popper-content-wrapper] {
+    @apply w-full md:w-auto;
+}
+
+[data-radix-menu-content] {
+    @apply rounded-none md:rounded-lg w-full md:w-auto;
+}
+
+[data-radix-menu-content] [role="menuitem"] {
+    @apply md:min-h-0 min-h-12;
+}
+
+.site-header > .container:before,
+.site-footer > .container:before {
+    background: radial-gradient(62.87% 100% at 50% 100%, var(--color-gray-200) 0%, rgba(255, 255, 255, 0) 100%);
+
+    bottom: 0;
+    content: "";
+    height: 1px;
+    left: 0;
+    position: absolute;
+    width: 100%;
+}
+
+.dark .site-header > .container:before,
+.dark .site-footer > .container:before {
+    background: radial-gradient(62.87% 100% at 50% 100%, rgba(255, 255, 255, .10) 0%, rgba(255, 255, 255, 0) 100%);
+}
+
+.site-footer > .container:before {
+    top: 0;
+}