Add isort and make note about null-ls

neovim/lua/lazy_plugins.lua

@@ -325,8 +325,10 @@ return {
 
     -- Generic linter/formatters in diagnostics API
     {
+        -- TODO: null-ls is archived and no longer maintained. It is replaced by none-ls
+        -- Replace with https://github.com/nvimtools/none-ls.nvim
         "https://github.com/jose-elias-alvarez/null-ls.nvim",
-        -- This is lazy and configured after lspis loaded in plugins/lsp.lua
+        -- This is lazy and configured after lsps loaded in plugins/lsp.lua
         lazy = true,
         branch = utils.map_version_rule({
             [">=0.8.0"] = utils.nil_val,

neovim/lua/plugins/null-ls/init.lua

@@ -49,6 +49,7 @@ function M.configure(options)
             null_ls.builtins.formatting.fish_indent,
             -- Python
             null_ls.builtins.formatting.reorder_python_imports,
+            null_ls.builtins.formatting.isort,
             null_ls.builtins.formatting.black,
             null_ls.builtins.diagnostics.mypy,
             -- Go