Add Anland Guide (#230)

Translated using Weblate (Chinese (Traditional Han script)) (#325)

app: fix: replace system DownloadManager with an in-app rootfs downloader

app: fix: replace system DownloadManager with an in-app rootfs downloader

Translated using Weblate (Chinese (Traditional Han script)) (#334)

fix: tear a container down with the config it booted with

net: keep the host off the gateway LAN over IPv6

fix: report a container as started only once init has exec'd

fix: attach enter/run beside init.scope, not inside it

docs: document resource limits

fix: name a gateway client's cable after the container, not its PID