Fixes/changes:
* Documentation and docsite improvements
* Fix issue 622, inconsistent default `census_version` used in various API endpoints
What's Changed
* pin builder dependencies by bkmartinjr in https://github.com/chanzuckerberg/cellxgene-census/pull/594
* pytorch eager fetch follow-up by atolopko-czi in https://github.com/chanzuckerberg/cellxgene-census/pull/592
* Adds sparse iter reference docs to doc-site by pablo-gar in https://github.com/chanzuckerberg/cellxgene-census/pull/597
* docs: Add newsletter banner by tihuan in https://github.com/chanzuckerberg/cellxgene-census/pull/605
* change error handling for /curation REST errors by bkmartinjr in https://github.com/chanzuckerberg/cellxgene-census/pull/608
* Add R acceptance tests, update Python acceptance tests by pablo-gar in https://github.com/chanzuckerberg/cellxgene-census/pull/576
* Expand doc-site section "Census data releases" and add data erratum by pablo-gar in https://github.com/chanzuckerberg/cellxgene-census/pull/600
* [r] get_seurat: allow selection of Seurat `counts` or `data` slot by mlin in https://github.com/chanzuckerberg/cellxgene-census/pull/607
* fixes minor documentation issues by pablo-gar in https://github.com/chanzuckerberg/cellxgene-census/pull/619
* Complete docstrings for PyTorch ExperimentDataPipe API by atolopko-czi in https://github.com/chanzuckerberg/cellxgene-census/pull/613
* consistently set default census version to stable by bkmartinjr in https://github.com/chanzuckerberg/cellxgene-census/pull/623
* add missing census_version param by bkmartinjr in https://github.com/chanzuckerberg/cellxgene-census/pull/624
* hard error if the builder receives an unsupported CXG schema version by bkmartinjr in https://github.com/chanzuckerberg/cellxgene-census/pull/625
* add do_not_delete flag to release.json format by bkmartinjr in https://github.com/chanzuckerberg/cellxgene-census/pull/628
New Contributors
* tihuan made their first contribution in https://github.com/chanzuckerberg/cellxgene-census/pull/605
**Full Changelog**: https://github.com/chanzuckerberg/cellxgene-census/compare/v1.3.0...v1.3.1