Fix deployment

[eimrek]

hi @edan-bainglass, great work on this.

I checked a bit and got the deployment working here: https://materialscloud-org.github.io/discover-sssp-react/

There were some some issues with the base path and build config, fixed.

But an additional issue was that the 150 MB of image files are included directly in the source code. As they are not directly imported, the build process will not include them in dist folder. And including all of them in the frontend (e.g. in the public folder) is not really feasible anyway (it would have to be loaded every time the webpage is accessed).

I currently just directly linked to the raw github URL, when the corresponding data is needed.

Currently i kept the src path, just to demonstrate that it works. But probably, this data should be moved out of the src folder to something like static_data.