Adding neodev plugin for better vim lsp

Signed-off-by: Taken <taken@mairimashita.org>

lua/taken/core/opts.lua

@@ -21,10 +21,10 @@ opt.softtabstop = 4
 opt.shiftwidth = 4
 opt.expandtab = true
 
-vim.opt.swapfile = false
-vim.opt.backup = false
-vim.opt.undodir = os.getenv("HOME") .. "/.vim/undodir"
-vim.opt.undofile = true
+opt.swapfile = false
+opt.backup = false
+opt.undofile = true
+opt.undodir = vim.fn.expand("~") .. "/.vim/undodir"
 
 opt.smartindent = true
 opt.wrap = false