Melf/update docs

[cqc-melf]

Description

Please summarise the changes.

Related issues

Please mention any github issues addressed by this PR.

Checklist

• I have performed a self-review of my code.
• I have commented hard-to-understand parts of my code.
• I have made corresponding changes to the public API documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have updated the changelog with any user-facing changes.

[Copilot]

Pull request overview

This PR reorganizes imports across several Python files to follow PEP 8 conventions (third-party imports before local imports), updates a documentation link, removes inline documentation build steps from the test workflow in favor of a dedicated docs workflow, and fixes type handling issues in test assertions and the ForestStateBackend.get_pauli_expectation_value method.

Key changes:

• Import statements reorganized to place standard library and third-party imports before local project imports
• Documentation link updated from deprecated URL to current GitHub repository
• GitHub Actions workflow refactored to separate documentation building into a dedicated workflow file

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/qvm_backend_test.py	Reorganized imports and wrapped integer assertions in complex() for type consistency
tests/pyquil_convert_test.py	Reorganized imports to follow PEP 8 ordering
pytket/extensions/pyquil/pyquil_convert.py	Reorganized imports and removed outdated noqa comment
pytket/extensions/pyquil/backends/forest.py	Reorganized imports and modified return statement in get_pauli_expectation_value to handle list output
docs/pytket-docs-theming	Updated subproject commit reference
docs/index.rst	Updated pyQuil documentation URL from deprecated domain to GitHub repository
.github/workflows/docs.yml	Added new dedicated workflow for documentation building
.github/workflows/build_and_test.yml	Removed documentation build steps from main test workflow

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