remove pythonlibs: Gohlke retired, site discontinued in 2022

Christoph Gohlke stopped maintaining the Windows binaries service.
Use conda-forge or pip with wheel packages instead.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vinta

README.md

@@ -734,7 +734,6 @@ Inspired by [awesome-php](https://github.com/ziadoz/awesome-php).
 
 *Python programming on Microsoft Windows.*
 
-* [pythonlibs](http://www.lfd.uci.edu/~gohlke/pythonlibs/) - Unofficial Windows binaries for Python extension packages.
 * [PythonNet](https://github.com/pythonnet/pythonnet) - Python Integration with the .NET Common Language Runtime (CLR).
 * [PyWin32](https://github.com/mhammond/pywin32) - Python Extensions for Windows.
 * [WinPython](https://winpython.github.io/) - Portable development environment for Windows 10/11.