chore: migrate to Tailwind CSS v4.0 (#632)

* chore: migrate PostCSS configuration to v4

* chore: update dependencies in package.json and package-lock.json

- Bump versions for autoprefixer, postcss, postcss-cli, prettier, and tailwindcss.
- Remove unused dependencies to streamline the project.

* chore: add @tailwindcss/postcss and update package-lock.json

* fix: update import paths in CSS files for consistency

* fix: change prefix from `hx-` to `hx:`

* chore: migrate primary color theme variables to CSS

* fix: remove unnecessary text decoration property from anchor styles in typography CSS

* fix: update CSS styles for improved consistency and clarity across components

* chore: clean up package.json and package-lock.json, remove unused dependencies, and update CSS imports for better organization

* fix: bulk replace prefix `hx-` with `hx:`

* fix: update tailwind css prefix

* fix: styling consistent issues

- steps counter fix in v4
- removed tailwind.css
- update hr border colors
- fix button cursor in v4
- fix border colors in various places

* fix: update class prefixes for consistency in menu and sidebar components

* fix: refine CSS classes and transitions for navbar and sidebar components

- Updated hamburger menu styles for improved animation and structure.
- Adjusted sidebar transition duration for smoother effects.
- Standardized class prefixes for consistency across components.

* fix: update border color in hero badge component for improved styling consistency

* fix: update tab button cursor style for improved user interaction

* chore: recompile css

* fix: dark mode color not applied for before / after elements

* fix: docs navigation

* chore: recompile CSS

* chore: update Tailwind CSS and PostCSS dependencies to version 4.0.17, recompile CSS, and add safelist

* fix: typo in class name and add back decoration-from-font for typography a tags

* fix: update class syntax for Tailwind CSS compatibility in mermaid code block

layouts/hextra-home.html

@@ -1,8 +1,8 @@
 {{ define "main" }}
-  <div class='hx-mx-auto hx-flex {{ partial "utils/page-width" . }}'>
+  <div class='hx:mx-auto hx:flex {{ partial "utils/page-width" . }}'>
     {{ partial "sidebar.html" (dict "context" . "disableSidebar" true) }}
-    <div class="hx-w-full hx-break-words hx-min-h-[calc(100vh-var(--navbar-height))] hx-min-w-0 hx-pb-8 hx-pt-8 md:hx-pt-12 hx-pl-[max(env(safe-area-inset-left),1.5rem)] hx-pr-[max(env(safe-area-inset-left),1.5rem)]">
-      <div class="hx-flex hx-flex-col hx-items-start">
+    <div class="hx:w-full hx:break-words hx:min-h-[calc(100vh-var(--navbar-height))] hx:min-w-0 hx:pb-8 hx:pt-8 hx:md:pt-12 hx:pl-[max(env(safe-area-inset-left),1.5rem)] hx:pr-[max(env(safe-area-inset-left),1.5rem)]">
+      <div class="hx:flex hx:flex-col hx:items-start">
         {{ .Content }}
       </div>
     </div>