`build` directory contains both development and production builds

make server creates files into the build/ directory, and make compile also creates files into the build/ directory. However, the ones created by the development server are nested in subdirectories and the ones created by the production build process aren't. This is a bit confusing, because when I have developed some stuff and afterwards I run make compile to get the production build, I end up with a build folder that still contains my development assets.

To prevent confusion, I suggest we have a build_dev/ directory for the development server