Add Quick Run section with complete getting-started workflow including
admin user creation via --execute flag. Consolidate Docker Compose to
treat reverse proxy as essential with Traefik/Caddy/nginx examples.
Move detailed image building to development guide, keeping deployment
docs focused on using pre-built images.
Create environment variables reference with practical examples and
context. Clarify built-in TLS is for testing only; production should
use reverse proxies.
Some of the improvements here include:
* rocksdb can actually use jemalloc now instead of just pulling in a
second rocksdb for no reason
* "complement-runtime" factored back out into shell file
* complement image no longer uses `mkDerivation` for `copyToRoot`
because that's what `buildEnv` is for
* complement image no longer sets `SERVER_NAME`, complement already does
that
* all packages were factored out into `callPackage`-able files for use
with a custom `lib.makeScope pkgs.newScope`
* new version of `mkPackage` has options that are easier to use and
override such as `features`
