Upcoming events features and fixes.

[kattni]

New feature:

• Events now have end_date which allows for adding an end date to multi-day events.
  • Can be left blank for single-day events.

Fixes:

• Upcoming events showing on News page again.
• Upcoming events are showing again on homepage.
  • Carousel removed, and replaced with static list.
  • CSS updated.

PR Checklist:

• All new features have been tested
• All new features have been documented
• I have read the CONTRIBUTING.md file
• I will abide by the code of conduct

[github-actions]

Visit the preview URL for this PR (updated for commit 1250e51):

https://beeware-org--pr626-upcoming-events-6h8guqyg.web.app

_{(expires Tue, 27 May 2025 20:23:14 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: b0da44bc067e7d9a4255c77cb2c5fce572218cec}

[freakboy3742]

Looks awesome - thanks! I've made a small tweak to the ordering on the upcoming events pages (matching the front page), and corrected the EuroPython dates (which wasn't your doing - but there wasn't an end-date when those dates were added.)