nvim: Fix spell dictionary not able to be found

Added the previously important 'site' directory to the runtime path of
neovim so it stops complaining about not finding spell dictionaries on
starting up with a spell-enabled file.

nvim/.config/nvim/init.lua

@@ -43,7 +43,7 @@ if not vim.loop.fs_stat(lazypath) then
         lazypath,
     })
 end
-vim.opt.rtp:prepend (lazypath)
+vim.opt.rtp:prepend(lazypath)
 
 -- set our leader key to space since with hjkl, space is largely useless
 -- needs to be set before lazy.nvim is loaded
@@ -54,3 +54,5 @@ require("lazy").setup("plugins")
 require('look')
 require('maps')
 
+-- to include e.g. the spell dictionaries for vim
+vim.opt.rtp:append(vim.fn.stdpath("data") .. "/site")