feat(none-ls): Add none-ls plugin for linting and formatting

lua/custom/plugins/none-ls.lua

@@ -0,0 +1,14 @@
+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.biome,
+        null_ls.builtins.diagnostics.biome,
+      }
+    })
+  end
+}