Added bootstrap links to the head

Started adding bootstrap, added the body to the "container-fluid" div.
Added bootstrap <div>'s

I placed the <article> and <aside> semantic elements within bootstrap
divs and I removed the size formatting from the CSS so that bootstrap
now controls it.
Changed Links to Buttons

I tried to change the links to buttons.  They do work, I just wanted
them to all be the same size and in a vertical menu.  I need to figure
that out, unless anyone knows how to make that happen.
Merge pull request #5 from ProgrammersLearningTogetherWesterly/PLT-Website-With-Bootstrap

Plt website with bootstrap