Add nuxt-developer documentation
[issue link](as opposed to nuxt-app-developer documentation)
Feature request
Add a surface level overview of the architecture of nuxt:
- What are the directories (in this repo, not a nuxt-based web app project)
- What is the build + testing process
- How directory watching and reloading is implemented
- How filesystem API is implemented
- How code-splitting is implemented
This will enable third party developers to make small contributions more easily, and potentially (it always happens) expose inefficiencies / incorrectness by talking through the architecture.