We need more width on project pages for the popcorn iframes #78
Description
Currently our main column on project pages (https://webmaker.org/projects/show-them-some-love-internet-style/ for example) have a main column width of 515px.
The provided width options for popcorn.webmaker.org embeds are 560, 640, 853 and 1280
We should see what we can do to provide a better grid layout for the project pages so we have space for things to fit without causing overflow.