Documentation improvements.

[delucchi-cmu]

• was missing 'sphinx_design' dependencies, so tab-sets didn't render properly
• updated acceptable python versions
• fix references
• update aggregate_column_statistics method for an upcoming change in hats-import documentation.

[github-actions]

Before [0cd372a]	After [bcedd9e]	Ratio	Benchmark (Parameter)
74.2±0.2ms	76.8±0.5ms	1.04	benchmarks.MetadataSuite.time_load_partition_join_info
18.5±0.09ms	19.1±0.3ms	1.03	benchmarks.MetadataSuite.time_load_partition_info_order6
74.2±0.4ms	76.0±2ms	1.03	benchmarks.MetadataSuite.time_load_partition_info_order7
40.5±0.6ms	40.8±0.7ms	1.01	benchmarks.Suite.time_pixel_tree_creation
112±0.3ms	112±0.3ms	1	benchmarks.time_test_alignment_even_sky
13.3±0.3ms	13.1±0.2ms	0.99	benchmarks.Suite.time_inner_pixel_alignment
368±4ms	361±3ms	0.98	benchmarks.Suite.time_outer_pixel_alignment
1.03±0.03ms	1.02±0.03ms	0.98	benchmarks.time_test_cone_filter_multiple_order

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (0cd372a) to head (2fad454).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #445   +/-   ##
=======================================
  Coverage   93.24%   93.24%           
=======================================
  Files          47       47           
  Lines        2012     2012           
=======================================
  Hits         1876     1876           
  Misses        136      136           

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