Move formatting configuration to separate file

templates/nvim/lua/lsp.lua.j2

@@ -187,27 +187,3 @@ vim.diagnostic.config {
     end
   },
 }
-
-local enable_formatting = os.getenv("enable_formatting") == 'true';
-
--- format buffers before saving for specific LSPs
-if (enable_formatting) then
-  vim.api.nvim_create_autocmd('LspAttach', {
-    group = vim.api.nvim_create_augroup('lsp', { clear = true }),
-    callback = function(args)
-      local client = vim.lsp.get_client_by_id(args.data.client_id)
-
-      if client.server_capabilities.documentFormattingProvider then
-        vim.api.nvim_create_autocmd('BufWritePre', {
-          buffer = args.buf,
-          callback = function()
-            vim.lsp.buf.format {
-              async = false,
-              id = args.data.client_id
-            }
-          end,
-        })
-      end
-    end
-  })
-end