Fix haddocks references to libraries

[carbolymer]

Changelog

- description: |
    Fix haddocks references to libraries. Use nix for building haddocks.
# 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

Previously links to other libraries e.g. base were broken. This PR replaces CI pipeline and custom script for building and publishing haddocks with nix-based pipeline.

Output: https://input-output-hk.github.io/cardano-api/

Sample pipeline run: https://github.com/input-output-hk/cardano-api/actions/runs/6888403096

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
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff