Fix URLs for cccl docs

[agirault]

Description

https://nvidia.github.io/cccl/cuda_cooperative/ and https://nvidia.github.io/cccl/cuda_parallel/ are 404s

Update to pages under https://nvidia.github.io/cccl/python/

Let me know if opening a github issue is necessary just for this

Checklist

My main dev machine with my gpg key for signing is down with power outage in our office, I'll resign and push tomorrow if that's required.

[copy-pr-bot]

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[kkraus14]

/ok to test

[copy-pr-bot]

/ok to test

@kkraus14, there was an error processing your request: E1

See the following link for more information: https://docs.gha-runners.nvidia.com/cpr/e/1/

[kkraus14]

/ok to test c329ca5

[github-actions]

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