Advertise events on get.gov

[kristinacyin]

Issue description

Implement design in Figma:

Design link (please check annotations/comments for more details)
Prototype link (shows how "Upcoming .gov events" link in homepage goes to events page in About section)

Acceptance criteria

• Edit "Learn about .gov domains" section home page
  • Remove ".Gov domains for election offices" from list
  • Replace it with "Upcoming .gov events" using USWDS icon "event"
  • Link "Upcoming .gov events" to "Events" page
• Create new "Events" page in About section
  • Update navigation menu on the top left of page
    • Replace ".Gov data" with "Data"
    • Replace ".Gov product updates" with "Product updates"
    • Add "Events" page
  • Add content to page as provided in Figma design (please check annotations/comments for more details)

Additional context

No response

Links to other issues

Implementing #1827 - Better advertise .gov townhalls (on manage.get.gov repo)

[vickyszuchin]

"refinement" label was added for Alysia to review the design. Since the scope and ACs are fine, I am removing it. We can review this ticket during upcoming refinement meeting.