The Git for Windows homepage

https://gitforwindows.org/

0. git clone https://github.com/git-for-windows/git-for-windows.github.io.git (this repo)
1. Install Node.js (contains the 'npm' package manager)
2. Install Grunt: npm install -g grunt-cli
3. Install Node.js' dependencies: cd git-for-windows.github.io && npm install
4. Run grunt to generate the files
5. Run grunt connect
6. Open http://localhost:4000 in your favorite browser to check the changes.

(Tested on XP, and onwards)