fix: Renaming

[CryptoKnightIOG]

https://input-output.atlassian.net/browse/ATL-7066

[mkbreuningIOHK]

The main point is to keep the same links for the repos as they are not migrated yet.
Also, I am not sure about some links for the demo. Who would know?
@yshyn-iohk , would you like to review the links such as:

• https://staging-docs.atalaprism.io is changed to https://staging-docs.github.com/hyperledger/identus
• https://demo.atalaprism.io is changed to https://demo.github.com/hyperledger/identus

[mkbreuningIOHK]

Some links changed could be first unchanged in a first step.
And then we see what to do.

You have modified the directory names so I would like this PR to be merged first as it seems the other PRs are dependent.

[mkbreuningIOHK]

Also, the PR check for documentation build fails with the error

This is caused by the fact that the directory docs/atala-prism/prism-mediator was renamed from atoll to identus.

But the change seems to have been done here in the branch, so this is strange: https://github.com/input-output-hk/atala-prism-docs/blob/ATL-7066-Renaming/documentation/docs/identus/mediator.md

[mkbreuningIOHK]

After the new commit, the comments were all taken into account and the documentation build is working.