Add Türkiye theme to extra themes

[ozdil]

Summary

Adds the Türkiye (21 Iconic Locations Edition) theme to the Extra Themes page.

• Repository: https://github.com/ozdil/omarchy-turkiye-theme
• Theme Details: Eye-friendly, OLED-optimized dark theme celebrating 21 of the most famous and breathtaking locations across Türkiye in razor-sharp vector art. Turkish crimson red primary accent paired with Mediterranean/Aegean turquoise, Cappadocia ochre yellow, Black Sea pine emerald, and Pamukkale white.
• Includes: 21 8K OLED vector wallpapers covering Cappadocia, Pamukkale, Göbeklitepe, Sümela, Nemrut, Ölüdeniz, Mardin, Ephesus, Salda Lake, Ishak Pasha Palace, Kaputaş, Ayder, Akdamar, Balıklıgöl, Safranbolu, Ani Ruins, Lake Tuz flamingos, Kızkalesi, Aspendos, Trojan Horse, and Uzungöl.