removed old keymaps from keymap.lua and ported them to the specific plugin files

lua/pika/plugins/neo-tree.lua

@@ -112,4 +112,8 @@ return {
 			"3rd/image.nvim",
 		},
 	},
+
+-- ─< Toggle NvimTree >─────────────────────────────────────────────────────────────────
+vim.keymap.set("n", "<leader>e", ":Neotree toggle<CR>", { noremap = true, silent = true, desc = "[e]xplorer" })
+
 }