feat: Add RTL support in public help center (#11692)

# Pull Request Template

## Description

This PR adds RTL support in public help center.

Fixes
https://linear.app/chatwoot/issue/CW-4459/support-for-rtl-in-public-help-center

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Loom video

https://www.loom.com/share/d48a26ec80e04545addca825882b4d79?sid=aa7a6b37-33bc-4f63-b1cc-54b27a7733cf

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/portal/application.scss

@@ -1,3 +1,4 @@
+// scss-lint:disable SpaceAfterPropertyColon
 @import 'tailwindcss/base';
 @import 'tailwindcss/components';
 @import 'tailwindcss/utilities';
@@ -7,7 +8,21 @@
 
 html,
 body {
-  font-family: 'InterDisplay', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, Noto Sans, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;
+  font-family:
+    'InterDisplay',
+    -apple-system,
+    system-ui,
+    BlinkMacSystemFont,
+    'Segoe UI',
+    Roboto,
+    'Helvetica Neue',
+    Tahoma,
+    Arial,
+    sans-serif,
+    'Noto Sans',
+    'Apple Color Emoji',
+    'Segoe UI Emoji',
+    'Noto Color Emoji';
   -moz-osx-font-smoothing: grayscale;
   -webkit-font-smoothing: antialiased;
   height: 100%;