Add basic documentation and link to MultiModal Universe LSDB/HATS Hugging Face datasets

[nevencaplar]

Closes #1234

[github-actions]

Before [e1de1de]	After [994565d]	Ratio	Benchmark (Parameter)
47.0±0.9ms	49.9±0.7ms	1.06	benchmarks.time_polygon_search
167±3ms	175±0.7ms	1.05	benchmarks.time_open_many_columns_list
372±7ms	387±7ms	1.04	benchmarks.time_open_many_columns_default
6.92±0.04s	7.00±0.03s	1.01	benchmarks.time_create_large_catalog
8.23±0s	8.34±0.02s	1.01	benchmarks.time_lazy_crossmatch_many_columns_all_suffixes
19.5±0.02s	19.7±0s	1.01	benchmarks.time_save_big_catalog
1.05±0.02s	1.05±0.01s	1	benchmarks.time_create_midsize_catalog
8.36±0.02s	8.34±0.01s	1	benchmarks.time_lazy_crossmatch_many_columns_overlapping_suffixes
3.83±0.03s	3.83±0.01s	1	benchmarks.time_open_many_columns_all
105±0.8ms	104±1ms	0.99	benchmarks.time_kdtree_crossmatch

Click here to view all benchmarks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (fbb3fea) to head (be8fc51).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1244   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files          46       46           
  Lines        2877     2877           
=======================================
  Hits         2781     2781           
  Misses         96       96           

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[hombit]

Looks great, thanks