feat: implement automatic image optimization with Astro Assets

- Configure content collections to use image() helper for type-safe image references
- Replace all <img> tags with <Image> component from astro:assets
- Migrate images from /public to /src/assets for automatic optimization
- Update blog posts to use relative paths in frontmatter (../../assets/photos/)
- Remove unused images and duplicates from /public folder
- Update Footer component to use optimized SVG icons
- Clean up manifest.json to use favicon.ico instead of deleted photos

Performance improvements:
- remote.jpg: 1.8MB → 128KB (93% reduction)
- me.png: 71KB → 12KB (83% reduction)
- Automatic WebP conversion
- Tree-shaking: only used images are optimized

/public folder reduced from 2.3MB to 32KB (only essential files)
Build output: 2.2MB with fully optimized images ready for S3 deployment

src/layouts/BaseLayout.astro

@@ -12,7 +12,7 @@ interface Props {
 
 const {
 	title,
-	description = "Lorenzo Iovino - Software Developer based in Sicily. Passionate about technology, remote work, and life balance.",
+	description = "Lorenzo Iovino - Software Engineer based in Sicily. Passionate about technology, remote work, and life balance.",
 	canonicalUrl,
 	image = "/photos/me.png",
 	type = "website",
@@ -21,7 +21,7 @@ const {
 	tags = [],
 } = Astro.props;
 
-const siteUrl = "https://lorenzoiovino.com";
+const siteUrl = "https://www.lorenzoiovino.com";
 const fullImageUrl = image.startsWith("http") ? image : `${siteUrl}${image}`;
 const fullCanonicalUrl = canonicalUrl || `${siteUrl}${Astro.url.pathname}`;