Speakers' avatar images broken for 2022, 2023, and 2024

### Status
- [x] EP2024 fixed
- [x] EP2023 fixed
- [ ] EP2022 still broken, see https://github.com/EuroPython/website/issues/988#issuecomment-2721705274

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Speakers' avatar images appear to be broken on the sites of 2022, 2023, and 2024. For speakers who had a profile picture, the image links are not resolving correctly. Examples:

- https://ep2024.europython.eu/speaker/sebastiaan-zeeff/
- https://ep2023.europython.eu/speaker/sebastiaan-zeeff/
- https://ep2022.europython.eu/speaker/sebastiaan-zeeff/

I’m not sure if the issue started after the vercel migration or if it was present earlier. (The images were definitely working during each year's conference days). However, I noticed a consistent typo in the avatar URLs: "porgramme" instead of "programme" across all three years.

For 2024, correcting the typo allows the URL to resolve:

✅ Fixed URL (2024):
https://programme.europython.eu/media/avatars/UPWXFZ_8SUI4OW.jpg

❌ Original broken URL (2024):
https://porgramme.europython.eu/media/avatars/UPWXFZ_8SUI4OW.jpg

However, fixing the typo does not work for 2023 and 2022:

❌ Broken URLs (2023 & 2022):
- https://porgramme.europython.eu/media/avatars/photo_square_cropped_1000_1000_fRtHpCV.jpg
- https://porgramme.europython.eu/media/avatars/photo_cropped_mqQp3VS.jpg

If fixing the links for previous years is too involved, it might be better to remove the avatar field altogether to avoid broken images on the site.