[website][upgrade]feat: website upgrade / docs migration - 2.1.1 / client/security/admin api (#13370)

* [website][upgrade]feat: website upgrade / docs migration - 2.2.1 / started/functions/concepts

Signed-off-by: LiLi <urfreespace@gmail.com>

* [website][upgrade]feat: website upgrade / docs migration - 2.1.1 / administration/deploy/io

Signed-off-by: LiLi <urfreespace@gmail.com>

* [website][upgrade]feat: website upgrade / docs migration - 2.1.1 / client/security/admin api

Signed-off-by: LiLi <urfreespace@gmail.com>

Co-authored-by: Anonymitaet <50226895+Anonymitaet@users.noreply.github.com>