The docs are reorganized around what you came to do

The docs are reorganized around what you came to do: getting started, your friends and the emails, your own AI agent, what every number in the record means, building on Elixir, and the policies. The docs home starts from those tasks, the rail on the left is the apps' rail with one group open and the page you are reading marked, and every page ends with what to read next and a way to tell us something on it is wrong. Every page kept its address, and an agent reading the docs through elixir_docs sees the same groups. No change to the tools.