Gt pew pew

Hey team, 

I spent some time adding the remaining sections included in the mockup to the homepage, and fixed up some of the styling. 

For example, I went back to using a max-height on the carousel, but only on the `.carousel-inner`, while setting `overflow: hidden`. This helps with the appearance at greater widths, although the caption was disappearing, so I had to change it's positioning to `display: absolute` and `top: 0px`. Going forward, all content within the carousel should be absolutely positioned relative to the top I think.

I added some social media icons to the footer, but they're way too big - just reasonably attractive. If anyone has some favourite icons lets just use those, but for now these are ok. Their layout breaks at some screen sizes.

Also, I couldn't get the partner logos to align vertically within their boxes. It drove me crazy.

Please take a look and let me know your thoughts! You can view my work using git by typing `git pull origin gtPewPew` then change to my branch with `git checkout gtPewPew`. 

Thanks ya'll!