[refactor] flipping configuration file generation strategy.
Flips the code generation around for configuration and manifest to be defined in dhall files. GHC then evaluates a dhall type expression at compile time. This allows for manual evolution of the Dhall code, which means easier documentation, code factoring, code presentation, and reduction in amount of generated files, so less duplication. Examples are also pulled out of the Haskell source and refactored to be more presentable. Cabal file generation is also removed.