Update insulation brand pages (Armaflex, Aeroflex, Maxflex)

- Added 3 new brand pages: armflex.astro, aeroflex.astro, maxflex.astro
- Updated hero images with product photos from 3t-insulation.com
- Enhanced content with product specifications and benefits
- Added standard certifications (FM Approved, UL 94, GREENGUARD)
- Added product gallery sections
- Shortened menu names to brand only (Armaflex, Aeroflex, Maxflex)
- Removed old ฉนวนหุ้มท่อ.astro page
- Updated Header and BaseLayout navigation
- Downloaded product images for all 3 brands

src/layouts/Layout.astro

@@ -15,7 +15,7 @@ const { title, description = "ดีล พลัส เทค - ระบบน
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="description" content={description} />
-    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <link rel="icon" type="image/png" href="/apple-touch-icon.png" sizes="180x180" />
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link href="https://fonts.googleapis.com/css2?family=Kanit:wght@400;500;600;700&family=Noto+Sans+Thai:wght@400;500;600&display=swap" rel="stylesheet" />