Add Farsi translation of the landing page

[SaharPak]

Description

Add RTL Farsi language support to the CV Roast landing page for Persian-speaking users.

What to include

• Translate all user-facing text in index.html to Farsi
• Add RTL layout support (dir="rtl" on html element)
• Ensure the dark theme and typography work well with Farsi script
• Add a language toggle (EN/FA) in the header or footer

Technical notes

• The page is a single index.html file — translations can be handled with a simple JS object
• Farsi uses right-to-left text direction
• Consider using vazirmatn font for Farsi text

How to contribute

1. Fork the repo
2. Add Farsi translations and RTL CSS
3. Test in both LTR (English) and RTL (Farsi) modes
4. Open a PR with your changes