The Problem and the solution
Set up a new website, domain and all, nginx is up and running. Users try to use your website and all of a sudden, your users see a 413 Request Entity Too Large error!
By default, nginx has this at 1 megabyte, which if you're running anything that involved uploading any files, especially videos or high res pictures, it just won't do.
There are several ways to go about fixing this and several values this directive will accept: