Bump sphinx-rtd-theme from 1.3.0 to 2.0.0 #1913

Job	Run time
No leftovers	4m 9s
CWL conformance (v1.0, docker)	3m 33s
build_test_container	8m 55s
CWL conformance (v1.0, singularity)	3m 24s
Test on macos-latest	11m 14s
CWL conformance (v1.0, podman)	3m 36s
cwltool release test	11m 7s
CWL conformance (v1.1, docker)	4m 56s
CWL conformance (v1.1, singularity)	5m 34s
Tox (3, 8, lint)	26s
CWL conformance (v1.1, podman)	5m 12s
Tox (3, 8, unit)	6m 36s
Linters (lintreadme)	53s
CWL conformance (v1.2, docker)	6m 36s
Tox (3, 8, bandit)	29s
Linters (shellcheck)	12s
CWL conformance (v1.2, singularity)	7m 20s
Tox (3, 8, mypy)	6m 55s
Linters (pydocstyle)	17s
CWL conformance (v1.2, podman)	6m 47s
Tox (3, 9, lint)	32s
CWL conformance (v1.2, docker, --fast-parser)	6m 21s
Tox (3, 9, unit)	6m 3s
Tox (3, 9, bandit)	33s
Tox (3, 9, mypy)	6m 9s
Tox (3, 10, lint)	35s
Tox (3, 10, unit)	6m 4s
Tox (3, 10, bandit)	30s
Tox (3, 10, mypy)	7m 59s
Tox (3, 11, lint)	33s
Tox (3, 11, unit)	6m 2s
Tox (3, 11, bandit)	24s
Tox (3, 11, mypy)	6m 41s
Tox (3, 12, lint)	28s
Tox (3, 12, unit)	7m 33s
Tox (3, 12, bandit)	28s
Tox (3, 12, mypy)	8m 0s
	2h 43m 6s

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