Update flyers and upload hexagonal stickers in PNG

[Alban Vidal]

Hello the flyers team,

Laura has updated the diversity logo with the new design.

I made this little changes:
- Upload all hexagonal stickers in PNG format,
- Show the PNG files instead of the SVG files (the render is better),
- Add link to download PNG or SVG files,
- Update the number of packages (56,800 in Buster) and regenerate all
flyers

Also, I created a new branch and merge request
(script_update_all_website_flyers) which include a bash script to update
all flyers

Regards,

Alban


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