I'm not sure why this is such a big problem, but hugo doesn't seem to like this. It is also better to just use the intended way to reassign vars always.
Before, *feature* images if using background.html would always get overwritten, now that is fixed.
This greatly reduces the number of inline styles in the project and enhances maintainability by avoiding a lot of duplicate code.
This also reduces the number of hashes required for a CSP since all previous background-image inline styles are now in main.css.
