Restructure Darwin configuration

So far, this is just based on mightymac. The other devices will be
updated soon.

modules/home-manager/files/nvim/lua/plugins/catppuccin.lua

@@ -1,57 +0,0 @@
-return {
-  "catppuccin/nvim",
-  name = "catppuccin",
-  flavour = "frappe", -- latte, frappe, macchiato, mocha
-  lazy = false,
-  priority = 1000,
-  config = function()
-    require("catppuccin").setup({
-      transparent_background = true,
-      color_overrides = {
-        frappe = {
-          base = "#07042B",
-          mantle = "#0c0746",
-          crust = "#10095d",
-          rosewater = "#FF7F7F", -- used for cursor
-        },
-      },
-      custom_highlights = function(colors)
-        return {
-          Comment = { fg = colors.subtext0 },
-          LineNr = { fg = colors.subtext0 },
-        }
-      end,
-    })
-    vim.cmd.colorscheme("catppuccin")
-  end,
-
-  --[[
-  -- original palette from frappe:
-	rosewater = "#f2d5cf",
-	flamingo = "#eebebe",
-	pink = "#f4b8e4",
-	mauve = "#ca9ee6",
-	red = "#e78284",
-	maroon = "#ea999c",
-	peach = "#ef9f76",
-	yellow = "#e5c890",
-	green = "#a6d189",
-	teal = "#81c8be",
-	sky = "#99d1db",
-	sapphire = "#85c1dc",
-	blue = "#8caaee",
-	lavender = "#babbf1",
-	text = "#c6d0f5",
-	subtext1 = "#b5bfe2",
-	subtext0 = "#a5adce",
-	overlay2 = "#949cbb",
-	overlay1 = "#838ba7",
-	overlay0 = "#737994",
-	surface2 = "#626880",
-	surface1 = "#51576d",
-	surface0 = "#414559",
-	base = "#303446",
-	mantle = "#292c3c",
-	crust = "#232634",
-  --]]
-}