Update links broken by migration

[smelc]

Changelog

- description: |
    Make it possible to merge again, by fixing dead links
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  - improvement    # QoL changes e.g. refactoring
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

A number of links have been made 404 by the GitHub migration, and as the CI checks links for validity, this is blocking merging.

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• NA New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[carbolymer]

Afaik we should use domains within cardano.intersectmbo.org for api docs.

[smelc]

@carbolymer> ready for rereview, only one link change in the end.

[carbolymer]

Thanks @smelc!