Add blog subpage with example post and nav link

[Copilot]

Adds a /blog section to the site with a listing page, per-post layout, and an initial example post. A "Blog" nav link is added to the home page header.

Changes

• _layouts/home.html – Added "Blog" nav link alongside existing "Contact" link; updated .site-nav to flexbox for multi-link spacing
• blog.html – Blog index using site.posts; renders title, date, and truncated excerpt per post
• _layouts/post.html – Post layout with date in header and nav back to Home/Blog
• _posts/2026-03-01-hello-world.md – Example "Hello World" post
• _sass/main.scss – Blog-specific styles: .blog-list, .blog-post-preview, .blog-post-title, .blog-post-meta, .blog-post-excerpt, .blog-post-content

Original prompt

Create a branch called feature/blog, in that branch I want to add a blog subpage to the existing site, please create a link to it from the main page and an example blog post

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