20.2.3 Patch release in the 20.2.x LTS series. Addresses minimal problems in some edge-cases, overall improves the documentation and infrastructure. Exercises some maintenance operations addressing problems surfaced when the previous tag 20.2.2 was released. * FIX: Address the problems of a sloppy merge (#2468) * FIX: ``DerivativesDataSink`` nondeterministic checksums fixed with ``niworkflows=~1.3.4`` (#2458) * FIX: Address dependency incompatibilities by pinning specific packages (#2463) * FIX: Unprotected import of ``sentry_sdk``, which is not a dependency (#2460) * ENH: Detect 3D & too-short BOLD series, warn and skip run's workflow building (#2461) * DOC: Transfer duplicated documentation to www.nipreps.org (#2469) * DOC: Better explanation on how spike regressors are generated (#2465) * DOC: Clarify that ``res-2`` entity does not mean 2mm (#2466) * MAINT: Containers - remove ``/root/.npm`` (#2464) * MAINT: Back port CircleCI configuration from dev branch (#2456)