Add event page for the weekly wednesday meeting

[rcannood]

Describe your changes

This PR adds an event page for the weekly wednesday working meetings we've been having on Discord.

Link: https://add-wednesday-meeting-eventpage--openproblems.netlify.app/events/weekly_wednesday_workmeeting/

Checklist before requesting a review

• [x] I have performed a self-review of my code

• Check the correct box. Does this PR contain:

  • [ ] Breaking changes
  • [x] New functionality
  • [ ] Major changes
  • [ ] Minor changes
  • [ ] Bug fixes

• [x] Proposed changes are described in the CHANGELOG.md

• [x] CI Preview succeeds and looks good!

[github-actions[bot]]