Docs: public README, setup guide and architecture, generic deploy files, and the T3 Code notice

scripts/hosts.conf.example

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+# Settings for renew-hosts.sh. Copy to hosts.conf, which git ignores, and fill in your machines.
+
+# SSH target for the machine running the gateway container.
+GATEWAY_SSH="gateway.example.lan"
+# The container runtime there, podman or docker, and the container's name.
+GATEWAY_RUNTIME="podman"
+GATEWAY_CONTAINER="wristcode-gateway"
+
+# label | SSH host, or "local" for the machine running the script | T3 URLs
+# URLs are space separated, preferred first. The gateway uses the first one that answers, so put
+# direct LAN or VPN routes first and a public URL last as the fallback.
+HOSTS=(
+  "Desktop|local|http://desktop.lan:3773 https://t3-desktop.example.com"
+  "Mac mini|mac.lan|http://mac.lan:3773"
+)