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/edgy.lua

@@ -1,65 +0,0 @@
-return {
-  "folke/edgy.nvim",
-  event = "VeryLazy",
-  opts = {
-    exit_when_last = false,
-    bottom = {
-      -- toggleterm / lazyterm at the bottom with a height of 40% of the screen
-      {
-        ft = "toggleterm",
-        size = { height = 0.2 },
-        -- exclude floating windows
-        filter = function(buf, win)
-          return vim.api.nvim_win_get_config(win).relative == ""
-        end,
-      },
-      "Trouble",
-      { ft = "qf", title = "QuickFix" },
-      {
-        ft = "help",
-        size = { height = 20 },
-        -- only show help buffers
-        filter = function(buf)
-          return vim.bo[buf].buftype == "help"
-        end,
-      },
-      { ft = "spectre_panel", size = { height = 0.4 } },
-    },
-    left = {
-      -- Neo-tree filesystem always takes half the screen height
-      {
-        title = "Neo-Tree",
-        ft = "neo-tree",
-        filter = function(buf)
-          return vim.b[buf].neo_tree_source == "filesystem"
-        end,
-        size = { height = 0.5 },
-      },
-      {
-        title = "Neo-Tree Git",
-        ft = "neo-tree",
-        filter = function(buf)
-          return vim.b[buf].neo_tree_source == "git_status"
-        end,
-        pinned = true,
-        open = "Neotree position=right git_status",
-      },
-      {
-        title = "Neo-Tree Buffers",
-        ft = "neo-tree",
-        filter = function(buf)
-          return vim.b[buf].neo_tree_source == "buffers"
-        end,
-        pinned = true,
-        open = "Neotree position=top buffers",
-      },
-      {
-        ft = "Outline",
-        pinned = true,
-        open = "SymbolsOutlineOpen",
-      },
-      -- any other neo-tree windows
-      "neo-tree",
-    },
-  },
-}