Centered menu on main page
Added mobile.css, currently the same as desktop version
Further development for mobile-only menu bar

Using System76's website as base for floating menu bar that's always at the top. Actual drop-down menu style thing will come after, since I seem to be having trouble with it. I also added a new INFO file to contain color codes, webpages, etc. to prevent dublicating material. I couldn't get css variables to work, otherwise those would be the colors.

Also, System76 has only one css file, but within it codes for screen width changes... Look into this more.