[1pt] Give link from Getting started with Cartridge to the Cartridge docs

## Info

**Root document:** https://www.tarantool.io/en/doc/latest/getting_started/getting_started_cartridge/

## What's wrong?

> Куда делась документация по картриджу? 

https://app.mopinion.com/dashboard/inbox/detail/4441609

Connected to #1996 