Data in events page was hardcoded and it is manually moved in the table.
Created a new events widget which will automatically move past and upcoming
events from events.json (`aio/content/marketing/events.json`) file to the
relevant table in the events tab
PR Close#36517
The `announcements.json` file should not be included in the sitemap and
including it causes an error in Google Search Console (because the
generated URL does not exist).
(This is a follow-up to fbef94a8e.)
PR Close#29754
