This commit updates the site metadata and styling in the `app/layout.tsx` file:
- Changes the title to "AderKI Blog" and the description to "Welcome to AderKI Blog. Explore hoodies, comics, books, and more in my personal store."
- Adds keywords, authors, and Open Graph metadata for better SEO and social sharing.
- Changes the default body styles to use a black background and white text with a sans-serif font.
In the `app/page.tsx` file, the changes include:
- Removes the default Next.js homepage content and replaces it with a simple header section.
- The header includes the site title "AderKI" and a brief description of the store.
- The main content area is left empty, as it will be filled with blog post components in a future commit.
These changes aim to set the foundation for the AderKI Blog, providing a more personalized and focused experience for the users.
