(core) Update onboarding flow

Summary:
A new onboarding page is now shown to all new users visiting the doc
menu for the first time. Tutorial cards on the doc menu have been
replaced with a new version that tracks completion progress, alongside
a new card that opens the orientation video.

Test Plan: Browser tests.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D4296

app/client/components/commandList.ts

@@ -25,7 +25,6 @@ export type CommandName =
   | 'expandSection'
   | 'leftPanelOpen'
   | 'rightPanelOpen'
-  | 'videoTourToolsOpen'
   | 'cursorDown'
   | 'cursorUp'
   | 'cursorRight'
@@ -269,11 +268,6 @@ export const groups: CommendGroupDef[] = [{
       keys: [],
       desc: 'Shortcut to open the right panel',
     },
-    {
-      name: 'videoTourToolsOpen',
-      keys: [],
-      desc: 'Shortcut to open video tour from home left panel',
-    },
     {
       name: 'activateAssistant',
       keys: [],