Moved PHP includes inside the `<head>` tag in `header.php` for proper structure and readability. Fixed a typo in variable name `$URLsorrection` in `index.php` to ensure correct script inclusion.
- Introduced meta.php to handle meta tags dynamically based on the presence of values in the $ometa array.
- Set default values for meta tags using predefined variables if $ometa values are not set.
- Included essential meta tags for SEO and social media sharing, including Open Graph and Twitter cards.
- Ensured compatibility with various devices by adding viewport and charset meta tags.
