There is only one html file in this template. It is well commented.
There are 3 css files inside of stylesheets folder.
One is main css style file: app.css
Other one is for general icon font: general/general_foundicons.css
Other one is for social icon font: social/social_foundicons.css
Other one is for IE8 support: ie8.css
javascripts folder contains javascript files. Javascripts enables our image slider, pop-ups etc. work well.
While changing icons you can look at to the these files. There below, you can see class names of other available many many icons. GENERAL ICONS and SOCIAL ICONS
In this template Foundation 4 Framework by ZURB is used.