Fix links for breast cancer and mouse ob, add deprecation warning.

[martinkim0]

Closes #1707.

[codecov[bot]]

Codecov Report

Base: 91.17% // Head: 91.12% // Decreases project coverage by -0.05% :warning:

Coverage data is based on head (1833360) compared to base (9420373). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1709      +/-   ##
==========================================
- Coverage   91.17%   91.12%   -0.06%     
==========================================
  Files         114      114              
  Lines        9460     9381      -79     
==========================================
- Hits         8625     8548      -77     
+ Misses        835      833       -2     

Impacted Files	Coverage Δ
scvi/data/_built_in_data/_csv.py	96.77% <100.00%> (ø)
scvi/train/_metrics.py	85.36% <0.00%> (-1.31%)	:arrow_down:
scvi/train/_logger.py	87.50% <0.00%> (-0.84%)	:arrow_down:
scvi/module/base/_jax_module_wrapper.py	93.40% <0.00%> (-0.66%)	:arrow_down:
scvi/module/base/_base_module.py	88.27% <0.00%> (-0.62%)	:arrow_down:
scvi/distributions/_negative_binomial.py	87.63% <0.00%> (-0.51%)	:arrow_down:
scvi/module/_scanvae.py	79.64% <0.00%> (-0.18%)	:arrow_down:
scvi/external/stereoscope/_module.py	96.19% <0.00%> (-0.18%)	:arrow_down:
scvi/module/_vaec.py	85.54% <0.00%> (-0.18%)	:arrow_down:
scvi/module/base/_decorators.py	94.28% <0.00%> (-0.16%)	:arrow_down:
... and 16 more

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