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/shortcodes/cards.html

@@ -1,5 +1,5 @@
 {{ $rows := .Get "rows" | default "3" }}
 
-<div class="hextra-cards mt-4 gap-4 grid not-prose" style="--rows: {{ $rows }};">
+<div class="hextra-cards hx-mt-4 hx-gap-4 hx-grid not-prose" style="--rows: {{ $rows }};">
   {{- .Inner -}}
 </div>