Update readme

Author: krekas

README.md

@@ -104,7 +104,6 @@ Example screenshots from Windmill theme:
 - [AdminLTE - Bootstrap 4](https://adminlte.io/)
 - [Plainadmin - Bootstrap 5](https://plainadmin.com/)
 - [Volt - Bootstrap 5](https://demo.themesberg.com/volt/) - contributed by [@knaazimkhan](https://github.com/knaazimkhan)
-- [SB Admin 2 - Bootstrap 4](https://startbootstrap.github.io/startbootstrap-sb-admin-2/) - contributed by [@pcmehrdad](https://github.com/pcmehrdad)
 
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