Removal of ini support in configuration

[Pierre-Sassoulas]

Type of Changes

	Type
✓	🔨 Refactoring
✓	📜 Docs

Description

Reading comments it seems this was planned, but are we really doing it ? It seem the rst generated rely on the functions. What do you think @DanielNoord ?

[DanielNoord]

I think this is blocked on pylint-config actually providing an updated and upgraded toml config file. It can generate a file based on current settings already but we want it to be a bit fancier.

After that I think most of this can be removed as there is no need to generate-rcfile anymore. I would still be in favour of deprecating the old command for 3.0 already as I think even pylint.toml is so much easier to parse as a format than the old ini formats.

[Pierre-Sassoulas]

Removing from 3.0 then, we should deprecate and remove later.