feat(nix): nix and back again

I tried Nix, but it had too many downsides so I removed it.

1. Didn't like that all files are immutable and simple config changes
need a complete rebuild.
2. Setting up a new Mac didn't work as smoothly as promised. Not worth
the effort.
3. It sucked a lot to always have to type in the password twice on each
darwin-rebuild
4. It solves problems I never had.

.config/nvim/lua/plugins/chatgpg.lua

@@ -0,0 +1,29 @@
+-- ChatGPT Neovim Plugin
+-- https://github.com/jackMort/ChatGPT.nvim
+return {
+	"jackMort/ChatGPT.nvim",
+	event = "VeryLazy",
+	keys = {
+		{
+			mode = "v",
+			"<leader>e",
+			function()
+				require("chatgpt").edit_with_instructions()
+			end,
+			desc = "Edit with instructions",
+		},
+	},
+	config = function()
+		local home = vim.fn.expand("$HOME")
+		local file_path = home .. "/.config/nvim/lua/plugins/chatgpg.txt.gpg"
+		require("chatgpt").setup({
+			api_key_cmd = "gpg --decrypt --use-agent " .. file_path,
+		})
+	end,
+	dependencies = {
+		"MunifTanjim/nui.nvim",
+		"nvim-lua/plenary.nvim",
+		"folke/trouble.nvim",
+		"nvim-telescope/telescope.nvim",
+	},
+}