Update configuration of docs build and dependencies.

docs/conf.py:

• enable sphinx_autodoc_typehints
• enable sphinx_toolbox.more_autodoc.typevars
• simplify path

pyproject.toml:

• remove 'make' dependency from docs - it's something else than GNU Make!
• docs require sphinx-autodoc-typehints, sphinx-toolbox
• update [all]
• add [dev]

ci/conda-env.yml:

• update and extend to cover pip-required packages

.gitlab-ci.yml:

• pages use ci-jax-pytorch image
• require jax,torch for pages

Supersedes !10 (closed)