Address Language Dropdown & Search Narrow Display Issue + Farsi Font Update

[poursalavati]

This pull request addresses two user interface issues:

Language Dropdown and Search Box in Narrow Display: Fixes the issue reported in #2035 and #1944 where the language dropdown menu (and search box) become inaccessible on narrow displays.

Farsi Font Update: Updates the Farsi font to the open-source Vazirmatn from Google Fonts. This improves compatibility and potentially resolves issues encountered with previous Vazir font implementations.

PS:
The PR has been updated to resolve an issue affecting the dark/light menu on medium and small screens. The updated code ensures consistent menu functionality across all screen dimensions:

Demo: https://deploy-preview-2057--docsydocs.netlify.app/
Multi-lingual demo: https://rdrp.ir

Before:

After:

Farsi Font correction + Dropdown menu

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[poursalavati]

Fixed a minor bug.

[chalin]

HI @poursalavati, thanks for your PR. Note that Docy's RTL support has been upgraded, for details see:

• #1442

So I'm unsure which parts of this PR are still relevant. I'm going to close this for now. Feel free to resubmit PRs -- I strongly suggest submitted separate PRs for each issue resolved. If you aren't able, I'll revisit this PR later when I have the time. Thanks!