API url has the wrong base url, requests seem to take forever

[fliphilipp]

I just tried to run the code in OA_photon.ipynb, and it looks like the API request is timing out.

I could get it to work by replacing https://openaltimetry.org/ with https://openaltimetry.earthdatacloud.nasa.gov/ in the API url, but both the API request and the plotting seem to be taking half an eternity now.