fix carbon intensity geo map

[RevantBabu]

Noticed Behaviour

Currently the "Carbon Intensity across the world" panel is not fully rendering. Screenshot below for reference:

Relevant error message can be seen in the browser console logs:

Local Reproduction

Can see the same behaviour while running the app locally

Issue/Proposed fix

• In the local reproduction, we can see its trying to access the absolute os.path - which isn't a valid/available URI for web server.
  Fix: Initially thought of moving world.geo.json form data folder to assets folder. But felt it's better to add a separate route for world.geo.json. Additionally fixed the loader IO route, which had similar issues with path
• After above change, the world map loads but is just plain. It doesn't show any carbonIntensity data or colour coded
  Fix: need to map the locations to "properties.ISO_A3" on world.geo.json using "featureidkey"

Behaviour after fix

Would be glad if you can review this PR and let me know of any comments. Happy to address any suggestions and make further commits.

Thanks
Revant

[Llannelongue]

Thanks for this! For now we've removed the map for the big release coming out this week, but knowing that it could be fixed like that means that we may put it back in in the coming months, so I'll keep this PR open to be able to merge it later.