Add old site contents for transition

As part of https://github.com/fontforge/fontforge.github.io/issues/25 I got access to the old SF.net FTP area, and I see that it uses a `.htaccess` to redirect visitors to http://fontforge.org; so we can move the pages to here at the same URLs, insert a message about the transition at the top of each old page, and update the redirect to point to http://fontforge.github.io.

My initial message is,

> This is part of the old website. New website begins at fontforge.github.io
> 
> Are you a web developer? Help us migrate this page on Github