API docs

The CodeIgniter 4 API docs are now online, at https://codeigniter4.github.io/api/

We are using phpDocumentor to generate them, from the documentation blocks in the "system" folder code. Changes should be proposed in the main repo, not in the "api" one. We use an admin script to automate their deployment.

There are a number of errors reported, and the docs don't appear to be complete yet. Please bear with as those are rectified - consider the API docs a work-in-progress for the time being.

James Parry
Project Lead