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.
Add documentation for the new performance-optimised Docker images with
"-maxperf" suffix. These use the release-max-perf build profile with LTO
and target haswell CPU architecture on amd64 for optimal performance.
Also restructure the static prebuilt binary section in generic deployment
docs for better clarity and fix various UK English spelling issues.
