Add Compose V2 instructions to FAQ

[Syriiin]

Just ran into this when setting up a new environment with Compose V2.
As Compose V1 is now deprecated, perhaps lazydocker should default to the new docker compose command?
Could be too soon to make this change though, as many people are still using older versions of docker that don't have Compose V2 support.

[jesseduffield]

We ought to just change the default to docker compose given most people should have that by now, and then have a doc explaining how to change it back to docker-compose. I'll create an issue for that.

[jesseduffield]

Nonetheless let's merge this!