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

exampleSite/content/_index.md

@@ -4,52 +4,52 @@ layout: hextra-home
 ---
 
 {{< hextra/hero-badge >}}
-  <div class="hx-w-2 hx-h-2 hx-rounded-full hx-bg-primary-400"></div>
+  <div class="hx:w-2 hx:h-2 hx:rounded-full hx:bg-primary-400"></div>
   <span>Free, open source</span>
   {{< icon name="arrow-circle-right" attributes="height=14" >}}
 {{< /hextra/hero-badge >}}
 
-<div class="hx-mt-6 hx-mb-6">
+<div class="hx:mt-6 hx:mb-6">
 {{< hextra/hero-headline >}}
-  Build modern websites&nbsp;<br class="sm:hx-block hx-hidden" />with Markdown and Hugo
+  Build modern websites&nbsp;<br class="hx:sm:block hx:hidden" />with Markdown and Hugo
 {{< /hextra/hero-headline >}}
 </div>
 
-<div class="hx-mb-12">
+<div class="hx:mb-12">
 {{< hextra/hero-subtitle >}}
-  Fast, batteries-included Hugo theme&nbsp;<br class="sm:hx-block hx-hidden" />for creating beautiful static websites
+  Fast, batteries-included Hugo theme&nbsp;<br class="hx:sm:block hx:hidden" />for creating beautiful static websites
 {{< /hextra/hero-subtitle >}}
 </div>
 
-<div class="hx-mb-6">
+<div class="hx:mb-6">
 {{< hextra/hero-button text="Get Started" link="docs" >}}
 </div>
 
-<div class="hx-mt-6"></div>
+<div class="hx:mt-6"></div>
 
 {{< hextra/feature-grid >}}
   {{< hextra/feature-card
     title="Fast and Full-featured"
     subtitle="Simple and easy to use, yet powerful and feature-rich."
-    class="hx-aspect-auto md:hx-aspect-[1.1/1] max-md:hx-min-h-[340px]"
+    class="hx:aspect-auto hx:md:aspect-[1.1/1] hx:max-md:min-h-[340px]"
     image="images/hextra-doc.webp"
-    imageClass="hx-top-[40%] hx-left-[24px] hx-w-[180%] sm:hx-w-[110%] dark:hx-opacity-80"
+    imageClass="hx:top-[40%] hx:left-[24px] hx:w-[180%] hx:sm:w-[110%] hx:dark:opacity-80"
     style="background: radial-gradient(ellipse at 50% 80%,rgba(194,97,254,0.15),hsla(0,0%,100%,0));"
   >}}
   {{< hextra/feature-card
     title="Markdown is All You Need"
     subtitle="Compose with just Markdown. Enrich with Shortcode components."
-    class="hx-aspect-auto md:hx-aspect-[1.1/1] max-lg:hx-min-h-[340px]"
+    class="hx:aspect-auto hx:md:aspect-[1.1/1] hx:max-lg:min-h-[340px]"
     image="images/hextra-markdown.webp"
-    imageClass="hx-top-[40%] hx-left-[36px] hx-w-[180%] sm:hx-w-[110%] dark:hx-opacity-80"
+    imageClass="hx:top-[40%] hx:left-[36px] hx:w-[180%] hx:sm:w-[110%] hx:dark:opacity-80"
     style="background: radial-gradient(ellipse at 50% 80%,rgba(142,53,74,0.15),hsla(0,0%,100%,0));"
   >}}
   {{< hextra/feature-card
     title="Full Text Search"
     subtitle="Built-in full text search with FlexSearch, no extra setup required."
-    class="hx-aspect-auto md:hx-aspect-[1.1/1] max-md:hx-min-h-[340px]"
+    class="hx:aspect-auto hx:md:aspect-[1.1/1] hx:max-md:min-h-[340px]"
     image="images/hextra-search.webp"
-    imageClass="hx-top-[40%] hx-left-[36px] hx-w-[110%] sm:hx-w-[110%] dark:hx-opacity-80"
+    imageClass="hx:top-[40%] hx:left-[36px] hx:w-[110%] hx:sm:w-[110%] hx:dark:opacity-80"
     style="background: radial-gradient(ellipse at 50% 80%,rgba(221,210,59,0.15),hsla(0,0%,100%,0));"
   >}}
   {{< hextra/feature-card