Bug: Remove "Join us in Pittsburgh" call to action

[brainwane]

Describe the bug

Currently, several pages on python.org include a call to action (see screenshot):

Join us in Pittsburgh, PA starting May 14, 2025. Grab your ticket today before we sell out! REGISTER FOR PYCON US!

This is no longer applicable, as it is no longer possible to register for PyCon US 2025. Let's remove this.

To Reproduce

1. Go to https://www.python.org/ .
2. Read past the line "Python is a programming language that lets you work quickly and integrate systems more effectively. Learn More"
3. The suggestion to register for PyCon US displays.

Expected behavior

No call to action displays.

URL to the issue

https://www.python.org/

Screenshots

"Join us in Pittsburgh, PA starting May 14, 2025. Grab your ticket today before we sell out! [button] REGISTER FOR PYCON US!"

Browsers

Firefox

Operating System

Linux

Browser Version

140

Relevant log output

Additional context

No response