Expand mission in the docs

[nevencaplar]

Expands the mission statement, with a nod to other surveys beyond LSST, and includes reference to Schmidt Observatories.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (fbb3fea) to head (59442ee).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1245   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files          46       46           
  Lines        2877     2877           
=======================================
  Hits         2781     2781           
  Misses         96       96           

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[github-actions]

Before [e1de1de]	After [d97b02d]	Ratio	Benchmark (Parameter)
26.3±0.3ms	26.7±0.3ms	1.01	benchmarks.time_box_filter_on_partition
91.2±0.7ms	92.3±2ms	1.01	benchmarks.time_kdtree_crossmatch
3.17±0.01s	3.19±0.02s	1.01	benchmarks.time_open_many_columns_all
7.01±0.01s	7.03±0.03s	1	benchmarks.time_lazy_crossmatch_many_columns_overlapping_suffixes
159±1ms	158±0.9ms	1	benchmarks.time_open_many_columns_list
19.4±0.1s	19.4±0.04s	1	benchmarks.time_save_big_catalog
341±4ms	338±2ms	0.99	benchmarks.time_open_many_columns_default
44.6±0.8ms	44.1±1ms	0.99	benchmarks.time_polygon_search
985±2ms	966±5ms	0.98	benchmarks.time_create_midsize_catalog
7.06±0.01s	6.93±0s	0.98	benchmarks.time_lazy_crossmatch_many_columns_all_suffixes

Click here to view all benchmarks.