The module __init__.py contains variables and functions that we want to be
available in all files.
The __main__.py serves as an entry point for the module and will call the
functions responsible for generating and copying the assets.
The generators/ folder contains processors for each kind of generatable assets
such as the markdown -> html generator.
Each .py file in the generators folder is imported as a module in no specific
order, if it exists, the prepare() function is first called, then once every
file that has a prepare function has been called, the main() function is then
called, also only if it exists.