Update WindowsPort.md as per #129 and other advisories

[citkane]

• Make users aware that cloning into a parent git repository can cause failure.
• Make users aware that having "C++ Clang Tools for Windows" installed may cause build failure and offer a workaround in the Webkit Command Prompt script.
• As per #129, choco installs Cmake 4+ by default since ~March 2025. This causes downstream issues with vcpkg woff2. Use Cmake 3.23 instead.
• Add option to set ccmake for pch in the Webkit Command Prompt

[citkane]

A successful build using the strategy in "WebKit command prompt" to prefix PATH with the VS bundled CMake 3.x: build.log

@iangrunert @donny-dont I am fairly happy that the documentation for Windows build reads better, works and is up to date. Would you give it another peruse when you have a chance. Note that I have NOT ventured into testing or more exotic build scenarios.

[citkane]

Note from the build log: -- Found Python: C:/Python313/python.exe (found version "3.13.6") found components: Interpreter, so I think that we are good with the default choco install python.

[iangrunert]

Sorry for the extreme delay, this fell off my radar.

You should squash the commits before merging.