Update ztf-alerts-sne.ipynb with better plots

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.33%. Comparing base (96b41f9) to head (43c33dc).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #565   +/-   ##
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  Coverage   97.33%   97.33%           
=======================================
  Files          43       43           
  Lines        1726     1726           
=======================================
  Hits         1680     1680           
  Misses         46       46           

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Before [96b41f9]	After [0c5a317]	Ratio	Benchmark (Parameter)
29.0±0.9ms	30.2±0.8ms	1.04	benchmarks.time_polygon_search
14.9±1ms	15.1±0.9ms	1.02	benchmarks.time_box_filter_on_partition
86.1±3ms	87.9±3ms	1.02	benchmarks.time_kdtree_crossmatch
12.7±0.2s	12.8±0.08s	1.01	benchmarks.time_create_large_catalog
1.90±0.04s	1.90±0.02s	1	benchmarks.time_create_midsize_catalog

Click here to view all benchmarks.