Add blog posts, cleanup unused files, update components

- Add 100 blog posts covering AI, development, and tech topics
- Add .env.example for environment configuration
- Add accessibility and lighthouse audit scripts
- Remove obsolete SEO reports and temporary files
- Remove dev-dist build artifacts and backup files
- Remove unused portrait images (moved/consolidated elsewhere)
- Update contact form and component improvements

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/messages/en.json

@@ -410,6 +410,7 @@
           "placeholder": "Your message to me..."
         },
         "submit": "Send Message",
+        "submitting": "Sending message...",
         "successMessage": "Thank you for your message! I will get back to you as soon as possible.",
         "errorMessage": "Sorry, there was an error sending your message."
       }