Primers
Getting started primer
Before any of the other primers are useful, you need a running site. This one is the on-ramp: what to install, the one command that gets you from a fresh clone to a working local site, and where the guardrails are before you start changing things. It doesn't replace Readme.md or BUILD.md — those are the command references, kept up to date as the build script changes — this primer is the orientation layer around them, with links out to the primer that covers each area in depth.