Add dynamic blog preview to homepage

- Create blog/posts.json for managing blog post metadata
- Add blog preview box (max 1/3 screen width) to homepage
- Fetch latest post dynamically with image and excerpt
- Updates automatically when new posts added to JSON
- Styled to fit no-scroll homepage layout
- Link to full blog page for each post

blog/posts.json

@@ -0,0 +1,10 @@
+[
+  {
+    "id": "01",
+    "title": "First Blog Post",
+    "date": "2026-02-28",
+    "excerpt": "This is the first blog post excerpt. Add your own blog entries by updating this JSON file with a title, date, image path, and excerpt.",
+    "image": "./src/img/CannotConnect.JPEG",
+    "slug": "first-blog-post"
+  }
+]