update astronvim to v3

config/astronvim/lua/user/mappings.lua

@@ -1,5 +1,21 @@
 return {
 	n = {
+
+		-- Buffers
+		["H"] = {
+
+			function()
+				require("astronvim.utils.buffer").nav( -(vim.v.count > 0 and vim.v.count or 1))
+			end,
+			desc = "Previous buffer",
+		},
+		["L"] = {
+			function()
+				require("astronvim.utils.buffer").nav(vim.v.count > 0 and vim.v.count or 1)
+			end,
+			desc = "Next buffer",
+		},
+
 		["<C-t>"] = { "<cmd>ToggleTerm<cr>", desc = "Toggle terminal" },
 		["<leader>fn"] = false,
 		["<leader>fo"] = false,