feat: add hx- prefix to Hextra Tailwind CSS classes (#300)

* feat: add prefix to tailwind css classes

* fix: remove unnecessary prefixes

* fix: add missing prefix in other places

* chore: regenerate hugo_stats.json

* chore: run `npm run build:css`

* chore: add `hx-` prefix to _index.fa.md

* fix: lang switcher display issue

* fix: add `hx-` prefix to showcase/index.fa.md

* fix: lang switch param mistake

layouts/partials/head.html

@@ -16,7 +16,7 @@
     {{ end -}}
   </title>
   <meta name="description" content="{{ partial "utils/page-description.html" . }}" />
-  
+
   {{ with .Params.canonical }}
     <link rel="canonical" href="{{ . }}" itemprop="url" />
   {{ else }}