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/sr.json

@@ -417,6 +417,7 @@
           "placeholder": "Vasa poruka za mene..."
         },
         "submit": "Posalji poruku",
+        "submitting": "Slanje poruke...",
         "successMessage": "Hvala vam na poruci! Javicu vam se sto je pre moguce.",
         "errorMessage": "Izvinite, doslo je do greske prilikom slanja vase poruke."
       }