Add page layout for static content without post metadata

[Copilot]

Adds a page layout for static pages (About, Contact, etc.) that don't need blog post metadata like dates and categories.

Changes

• New layout: _layouts/page.html - simplified version of post.html without date, categories, and category modal
• Example pages: about.md and contact.md demonstrating the layout
• Cleanup: Added vendor/ to .gitignore

Usage

---
title: About
layout: page
---

Your content here...

The layout maintains the theme's design consistency while removing post-specific elements.

Original prompt

add support for pages with a new layout named page. Keep it simple like blog post page

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