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?
why is the id called "fluid-projects-02"? I don't see any others so I'm not sure why it has a numbered suffix, also it breaks the fluid-web namespace that is used elsewhere.