Changed PI4DEC endpoint to a place where we can more easily modify it.

[WheezeNL]

If you're adding a new endpoint make sure that

• [ x] The new entry is at the correct (alphabetically sorted) line.
• [ x] The endpoint is valid according to https://validator.spaceapi.io/ui

[s3lph]

Thanks for the update. However, two things about your endpoint:

• You're not setting a CORS header, preventing your endpoint from being used by browser-based SpaceAPI clients. Implementing this is as simple as setting an Access-Control-Allow-Origin: * header in your endpoint's HTTP response.
• SpaceAPI v14 and later only use the api_compatibility field. The api field (that you set to 15) was only used until v0.13. The fact that the validator currently accepts this is unintended. I recommend you remove the api field from your endpoint.