I own a domain with a Apache server running Wordpress (example.com), whose configuration I can probably tweak (if I can propose a good solution).
I have a GitHub Pages hosting (example.github.io), whose server configuration I of course cannot touch (except some basics: http://bit.ly/1LZdhBT).
I want a specific directory of my domain (example.com/documentation) to point to my github.io site, without the user noticing (the point is the keep exiting URLs valid).
Is this possible?