Restore welcome test (jupyterlab#14946)

* Restore welcome test

* Update snapshots

* Update terminal layout snapshot

Author: fcollonval

galata/test/documentation/general.test.ts

@@ -16,8 +16,7 @@ test.use({
 });
 
 test.describe('General', () => {
-  // FIXME restore when ipywidgets support lumino 2
-  test.skip('Welcome', async ({ page }) => {
+  test('Welcome', async ({ page }) => {
     await galata.Mock.freezeContentLastModified(page);
     await page.goto();
     await page.addStyleTag({

galata/test/documentation/general.test.ts-snapshots/jupyterlab-documentation-linux.png

@@ -98,7 +98,8 @@
   "@jupyterlab/fileeditor-extension:tab-space-status": "Adds a file editor indentation status widget.",
   "@jupyterlab/help-extension:about": "Adds a \"About\" dialog feature.",
   "@jupyterlab/help-extension:jupyter-forum": "Adds command to open the Jupyter Forum website.",
-  "@jupyterlab/help-extension:resources": "Adds commands to Jupyter reference documentation websites.",
+  "@jupyterlab/help-extension:open": "Add command to open websites as panel or browser tab.",
+  "@jupyterlab/help-extension:resources": "Adds menu entries to Jupyter reference documentation websites.",
   "@jupyterlab/help-extension:licenses": "Adds licenses used report tools.",
   "@jupyterlab/htmlviewer-extension:plugin": "Adds HTML file viewer and provides its tracker.",
   "@jupyterlab/hub-extension:plugin": "Registers commands related to the hub server",