added fix for .js formatting

lua/custom/plugins/null-ls.lua

@@ -0,0 +1,23 @@
+-- This fixes JS formatting
+-- since the autoformat plugin provided by the kickstart
+-- does not support tsserver (see kickstart.plugins.autoformat)
+-- this is ment to provide safe formatting using prettier.
+-- 
+-- This could also be extended to support other languages
+-- but at the moment it serves a a fix for JS (tsserver) formatting
+
+return {
+	'jose-elias-alvarez/null-ls.nvim',
+	config = function()
+		local null_ls = require("null-ls")
+		local formatter = null_ls.builtins.formatting
+
+		null_ls.setup({
+			sources = {
+				formatter.prettier,
+				-- null_ls.builtins.diagnostics.eslint,
+				-- null_ls.builtins.completion.spell,
+			},
+		})
+	end
+}