Remove methods that were moved to client repo #316

Job	Run time
Test with nox (ubuntu-20.04, 3.11, ci_checks_max)	1m 16s
Build distribution packages	17s
Test with nox (ubuntu-20.04, 3.11, pytest_min)	51s
Cross-arch tests with nox	0s
Test documentation website generation	35s
Cross-arch tests with nox	0s
Test package installation in different architectures	2m 58s
Test with nox	1s
Publish documentation website to GitHub pages	0s
Create GitHub release	0s
Publish packages to PyPI	0s
	5m 58s

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