Move NvimTree file explorer to left side

- Change side from 'right' to 'left' in nvim-tree.lua
  - Update edgy.nvim config to place NvimTree in left panel

lua/cargdev/plugins/persistence.lua

@@ -0,0 +1,15 @@
+return {
+  "folke/persistence.nvim",
+  event = "BufReadPre",
+  opts = {
+    dir = vim.fn.expand(vim.fn.stdpath("state") .. "/sessions/"),
+    options = { "buffers", "curdir", "tabpages", "winsize", "help", "globals", "skiprtp" },
+    pre_save = nil,
+    save_empty = false,
+  },
+  keys = {
+    { "<leader>qs", function() require("persistence").load() end, desc = "Restore session" },
+    { "<leader>ql", function() require("persistence").load({ last = true }) end, desc = "Restore last session" },
+    { "<leader>qd", function() require("persistence").stop() end, desc = "Don't save session" },
+  },
+}