Improve f3d-media and add a f3d-data

[mwestphal]

https://github.com/f3d-app/f3d-media exists to store images and videos for https://f3d.app, but the status is not great.

f3d-data should be created to help the data used for the gallery and then some.

[mwestphal]

for safe keeping: splat files: https://drive.google.com/file/d/1kn3EvIpaKokwvBJNMuWZjo1wgbMqJI2p/view

[Meakk]

Images used in doc will be eventually moved into the website assets in f3d-website repository

[mwestphal]

no need for f3d-data then. I've archive f3d-media.