put ressources in repo instead of remotely

[tharvik]

let’s also make sure we have the needed resources in our repos, if people want to deploy somewhere else in the future (cf @martinjaggi)

currently, our gcloud server is hosting some images, models, and datasets. we should not depend on it.

[JulienVig]

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

[tharvik]

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)

[tharvik]

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,

[tharvik]

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.