treesitter: ensure 'javascript' installed along with typescript and tsx

This parser is actually needed for some *JSX* parsing, and since
typescript and tsx are already getting installed, it makes sense to
also install the javascript parser.

init.lua

@@ -313,7 +313,7 @@ vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { de
 -- See `:help nvim-treesitter`
 require('nvim-treesitter.configs').setup {
   -- Add languages to be installed here that you want installed for treesitter
-  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'tsx', 'typescript', 'vimdoc', 'vim' },
+  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'tsx', 'javascript', 'typescript', 'vimdoc', 'vim' },
 
   -- Autoinstall languages that are not installed. Defaults to false (but you can change for yourself!)
   auto_install = false,