first working bunch of plugins

lua/custom/plugins/none-ls.lua

@@ -0,0 +1,19 @@
+return {
+    {
+      "nvimtools/none-ls.nvim",
+      config = function()
+        local null_ls = require("null-ls")
+        null_ls.setup({
+          sources = {
+            null_ls.builtins.formatting.stylua,
+            null_ls.builtins.formatting.prettier,
+            null_ls.builtins.diagnostics.erb_lint,
+            null_ls.builtins.diagnostics.rubocop,
+            null_ls.builtins.formatting.rubocop,
+          },
+        })
+
+        vim.keymap.set("n", "<leader>gf", vim.lsp.buf.format, {})
+      end,
+    }
+}