put ressources in repo instead of remotely about disco HOT 4 OPEN

I think assets were removed from the repo in the past to make it more lightweight but we could rely on git-lfs rather than gcloud

from disco.

we could rely on git-lfs rather than gcloud

that's the way to go, and what I'm implementing for the wikitext dataset (used to test LLM models)

from disco.

Task have a DisplayInformation field that allow for an example image to be added. theses images are stored on Google storage. to have theses ressources locally (and to not immensly increase discojs-core bundle size), it will need to be provided via the server.
thus implementing #647 makes sense to do before this issue,

from disco.

having users using git-lfs is non-trivial for general use. let's add a way to download theses from the server, and a button "use sample data" on the webapp.

from disco.