feat: up flake, configure dap for rust and change some neovim defaults

programs/neovim/user/options.lua

@@ -7,6 +7,9 @@ return {
     spell = false, -- sets vim.opt.spell
     signcolumn = "auto", -- sets vim.opt.signcolumn to auto
     wrap = false, -- sets vim.opt.wrap
+    autochdir = true, -- automatically change the current directory
+    autowrite = true, -- write file on modification
+    grepprg = "rg --vimgrep", -- use ripgrep on grep actions
   },
   g = {
     mapleader = " ", -- sets vim.g.mapleader