Summary: Added pricing for Каменный ковер

Why It Matters: Customers can now see how much Каменный ковер costs.

What Changed:

• Added links to "about", "raschet", and "partners" pages.
• Added a new section called "Материалы для каменного ковра" (Materials for stone carpet).
• This new section lists "Клей" (Glue), "Камень" (Stone), "Профили" (Profiles), and "Инструменты" (Tools) with links.
• Updated the "Сколько стоит каменный ковер" (How much does stone carpet cost) section.
• This section now shows detailed pricing for materials and installation per square meter.
• Added new sections with images and titles: "Крыльцо из каменного ковра" (Porch from stone carpet), "Бассейн из каменного ковра" (Pool from stone carpet), "Отделка цоколя и входной группы" (Finishing of plinth and entrance group), and "Полы из каменного ковра" (Floors from stone carpet).
• Added a new section called "Отзывы о каменном ковре" (Reviews about stone carpet).
• Added a new section about "Вазоны" (Vases) made from stone carpet, including a video link.