FLUID-5516: Updated build site to match new design.

@jobara @acheetham - I've updated the build site to match the new designs. Can you check to make sure I got all the right demos and that the links all go to the right places?
If the purpose of this folder is to contain the resources used to generate the font files, I think the wording of this opening paragraph could make that more clear. Perhaps "This folder contains icons used to generate the 'fluid-community' font, which is used for the "community links" section of the Fluid website. (Similarly for the fluid-star folder)