fix(insulation): remove 7 gallery images + restore Product Details

Two fixes:

1 Deleted 7 product photos user requested:
- rockwool/gallery-8.jpg
- microfiber/gallery-9.jpg
- maxflex/gallery-2.jpg
- aeroflex/gallery-7.jpg
- aeroflex/gallery-15.jpg
- armflex/gallery-6.jpg
- armflex/gallery-7.jpg

Also updated gallery HTML in 5 pages to skip the deleted image
numbers. After deletion: rockwool=10, microfiber=9, maxflex=8,
aeroflex=13, armflex=5.

2) Restored Product Details section for armflex, aeroflex, and
maxflex. These 3 pages had their content stripped earlier in
the session (only kept Hero + Gallery + CTA). Pulled the
original Product Details from commit 17f4eb7 (which had the
full data: features, specs, certifications, applications,
water-vapor resistance values, etc.).

armflex: 10.3KB restored
aeroflex: 9.6KB restored
maxflex: 10.1KB restored
EOF
)

src/pages/microfiber.astro

@@ -270,9 +270,6 @@ const description = "MICROFIBER ผู้ผลิตฉนวนใยแก้
             <a href="/images/microfiber/gallery-8.jpg" target="_blank" rel="noopener" class="group block overflow-hidden rounded-xl shadow-md hover:shadow-xl transition-shadow">
               <img src="/images/microfiber/gallery-8.jpg" alt="Microfiber ภาพที่ 8" class="w-full h-48 object-cover group-hover:scale-105 transition-transform duration-300" loading="lazy" />
             </a>
-            <a href="/images/microfiber/gallery-9.jpg" target="_blank" rel="noopener" class="group block overflow-hidden rounded-xl shadow-md hover:shadow-xl transition-shadow">
-              <img src="/images/microfiber/gallery-9.jpg" alt="Microfiber ภาพที่ 9" class="w-full h-48 object-cover group-hover:scale-105 transition-transform duration-300" loading="lazy" />
-            </a>
             <a href="/images/microfiber/gallery-10.jpg" target="_blank" rel="noopener" class="group block overflow-hidden rounded-xl shadow-md hover:shadow-xl transition-shadow">
               <img src="/images/microfiber/gallery-10.jpg" alt="Microfiber ภาพที่ 10" class="w-full h-48 object-cover group-hover:scale-105 transition-transform duration-300" loading="lazy" />
             </a>