Cleaning up dead code and malformed docs.

[anoto-moniz]

Citrine Python PR

Removing some obsolete fixtures and fixing a couple old docs references.

Adapted from #1022

Description

Please briefly explain the goal of the changes/this PR.
The reviewer should be able to understand why the change is being made by reading this description
and its links (e.g. JIRA tickets).

PR Type:

• Breaking change (fix or feature that would cause existing functionality to change)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Maintenance (non-breaking change to assist developers)

Adherence to team decisions

• I have added tests for 100% coverage
• I have written Numpy-style docstrings for every method and class.
• I have communicated the downstream consequences of the PR to others.
• I have bumped the version in __version__.py

[kroenlein]

Looks good