tt 2.0 app layout

[p7nov]

Product: tt cli
Since: tt 2.0
Audience/target: all
Root document: https://www.tarantool.io/en/doc/latest/reference/tooling/tt_cli/configuration
SME: @ psergee, @ YanaPod

Details

From tt 2.0.0. changelog:

• Working directory is changed to an application source directory.
  If the application is a script, new working directory will be created
  in instances enabled location.
• Re-worked application runtime artifacts layout: app section relative
  paths are considered relative to working directory, which is an application
  source directory. Application name sub-directory no longer used for relative
  paths. Default names are changed for PID-files, control sockets and log files.

Revise the tt app layout description to reflect the actual kayout of tt 2.0+

Definition of done

• The tt app description reflects the actual structure of tt 2.0+ config