change the global font-family to Trebuchet MS

Signed-off-by: jaredq <jaredqin@gmail.com>
fill the 3 programs' pages: one-one tutoring, english classes and
broadband for seniors

Signed-off-by: jaredq <jaredqin@gmail.com>
using Trebuchet MS font, and fill 3 programs' pages
Merge branch 'master' of https://github.com/jaredq/DixonHouseWebsite