Remove `7php.com`

Not updated.

README.md

 * [PHP UG](https://php.ug) - A website to help people locate their nearest PHP user group (UG).
 * [PHP Watch](https://php.watch/) - PHP articles, news, upcoming changes, RFCs and more.
 * [PHP Weekly](https://www.phpweekly.com/archive.html) - A weekly PHP newsletter.
-* [Seven PHP](https://7php.com/) - A website that interviews members of the PHP community.
 * [Unit Testing Tips](https://testing-tips.sarvendev.com/) - Unit Testing Tips by examples in PHP.
 
 ### PHP Books