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/_default/_markup/render-codeblock-mermaid.html

@@ -1,4 +1,4 @@
-<pre class="mermaid hx-mt-6">
+<pre class="mermaid hx:mt-6">
   {{ .Inner | htmlEscape | safeHTML }}
 </pre>
 {{- .Page.Store.Set "hasMermaid" true -}}

layouts/_default/_markup/render-codeblock.html

@@ -4,7 +4,7 @@
 {{- $lang := .Attributes.lang | default .Type -}}
 
 
-<div class="hextra-code-block hx-relative hx-mt-6 first:hx-mt-0 hx-group/code">
+<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
   {{- partial "components/codeblock" (dict "filename" $filename "lang" $lang "base_url" $base_url "content" .Inner "options" .Options) -}}
 
   {{- if or (eq site.Params.highlight.copy.enable nil) (site.Params.highlight.copy.enable) -}}

layouts/_default/_markup/render-heading.html

@@ -1,7 +1,7 @@
 <h{{ .Level }}>
   {{- .Text | safeHTML -}}
   {{- if gt .Level 1 -}}
-    <span class="hx-absolute -hx-mt-20" id="{{ .Anchor | safeURL }}"></span>
+    <span class="hx:absolute hx:-mt-20" id="{{ .Anchor | safeURL }}"></span>
     <a href="#{{ .Anchor | safeURL }}" class="subheading-anchor" aria-label="Permalink for this section"></a>
   {{- end -}}
 </h{{ .Level }}>