refactor: update blog layout and components

- Removed the PostSummary component and replaced it with a new PostElement component for better post display.
- Introduced SocialLinks and Welcome sections to enhance the homepage layout.
- Updated the index page to utilize the new sections, improving overall structure and user experience.

src/components/PostElement.astro

@@ -14,6 +14,10 @@ const formattedDate = dayjs(post.data.pubDate.toString()).format("MMMM DD, YYYY"
 <style lang="scss">
 	@use "../scss/variables" as *;
 
+	a {
+		color: $colorText;
+	}
+
 	small {
 		font-size: $fontSizeBase * 0.75;
 		opacity: 0.5;