Update and remove supermaven.

lua/plugins/supermaven.lua

@@ -1,14 +0,0 @@
-return {
-  "supermaven-inc/supermaven-nvim",
-  config = function()
-    require("supermaven-nvim").setup({
-      keymaps = {
-        accept_word = "<C-y>",
-        accept_suggestion = "<C-j>",
-        clear_suggestion = "<C-n>",
-      },
-      disable_builtin_keymaps = false,
-      disable_keymaps = false,
-    })
-  end,
-}