fix(contact): resolve EmailJS reCAPTCHA issue and clean up

- Contact form now working after disabling reCAPTCHA in EmailJS template
- Remove temporary troubleshooting guides (EMAILJS_SETUP_GUIDE.md, EMAILJS_TROUBLESHOOTING.md, EMAILJS_DIAGNOSTIC.md)
- EmailJS integration fully functional with snackbar notifications
- Cross-browser compatible contact form with professional email delivery
- Add comprehensive debugging and error handling
- Contact form successfully sends emails to davidsyagustin@gmail.com

Author: davidagustin