refactor: remove Pagination component and restructure blog page

- Deleted the Pagination component as it is no longer needed.
- Refactored the blog page to directly display posts without pagination.
- Introduced a new index page to list all blog posts in a single view.

src/components/Pagination.astro

@@ -1,35 +0,0 @@
----
-type Props = {
-	readonly nextUrl?: string;
-	readonly prevUrl?: string;
-};
-
-const { nextUrl, prevUrl } = Astro.props;
----
-
-<style lang="scss">
-	div {
-		text-align: center;
-	}
-
-	span {
-		margin: 0 2em;
-	}
-</style>
-
-<div>
-	{
-		prevUrl && (
-			<span>
-				<a href={prevUrl}>&lt; Prev</a>
-			</span>
-		)
-	}
-	{
-		nextUrl && (
-			<span>
-				<a href={nextUrl}>Next &gt;</a>
-			</span>
-		)
-	}
-</div>