Drop 20.09 channel

[ncfavier]

Since it has reached the end of its support lifetime and is not being updated anymore.

[github-actions]

🚀 Deployed on https://61e552ff9f4ef34f154f8b71--nixos-search.netlify.app

[ncfavier]

I don't understand what this list is for, or why there's a 21.09 in there:

nixos-search/src/Search.elm

Lines 589 to 615 in f31e580

	flakes =
	[ { id = "latest-nixos-21.11-latest"
	, isNixpkgs = True
	, title = "Nixpkgs 21.11"
	, source = ""
	}
	, { id = "latest-nixos-21.05-latest"
	, isNixpkgs = True
	, title = "Nixpkgs 21.05"
	, source = ""
	}
	, { id = "nixos-21.09-latest"
	, isNixpkgs = True
	, title = "Nixpkgs 21.09"
	, source = ""
	}
	, { id = "latest-nixos-unstable"
	, isNixpkgs = True
	, title = "Nixpkgs Unstable"
	, source = ""
	}
	, { id = "flakes"
	, isNixpkgs = False
	, title = "Public Flakes"
	, source = ""
	}
	]

[garbas]

I don't understand what this list is for, or why there's a 21.09 in there:

nixos-search/src/Search.elm

Lines 589 to 615 in f31e580

	flakes =
	[ { id = "latest-nixos-21.11-latest"
	, isNixpkgs = True
	, title = "Nixpkgs 21.11"
	, source = ""
	}
	, { id = "latest-nixos-21.05-latest"
	, isNixpkgs = True
	, title = "Nixpkgs 21.05"
	, source = ""
	}
	, { id = "nixos-21.09-latest"
	, isNixpkgs = True
	, title = "Nixpkgs 21.09"
	, source = ""
	}
	, { id = "latest-nixos-unstable"
	, isNixpkgs = True
	, title = "Nixpkgs Unstable"
	, source = ""
	}
	, { id = "flakes"
	, isNixpkgs = False
	, title = "Public Flakes"
	, source = ""
	}
	]

I think this is something @ysndr added when trying to use flakes backend for nixpkgs as well. I think we should at least comment this portion out if not remove it completely.

@ysndr what do you think?

[ncfavier]

Merging now, I'll leave it to him for another PR.

[ysndr]

The flakes were designed to be grouped with groups for the nixpkgs versions
Yet we decided to keep nixpkgs separate what is left is different groups in the front end code