Merge branch 'update-docs' into 'master'

.gitlab-ci.yml

bilby/core/grid.py

bilby/core/likelihood.py

bilby/core/prior/analytical.py

bilby/core/prior/base.py

bilby/core/prior/conditional.py

bilby/core/prior/dict.py

bilby/core/prior/interpolated.py

bilby/core/prior/joint.py

bilby/core/prior/slabspike.py

bilby/core/result.py

bilby/core/sampler/__init__.py

bilby/core/sampler/base_sampler.py

bilby/core/sampler/cpnest.py

bilby/core/sampler/dnest4.py

bilby/core/sampler/dynamic_dynesty.py

bilby/core/sampler/dynesty.py

bilby/core/sampler/emcee.py

bilby/core/sampler/fake_sampler.py

bilby/core/sampler/kombine.py