Tidy up the getting-started page

[gitosaurus]

Recommend filters on opening, add references, correct some parameters

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[github-actions]

Before [29b15c7]	After [38eb092]	Ratio	Benchmark (Parameter)
24.0±0.2ms	24.0±0.3ms	1	benchmarks.time_box_filter_on_partition
80.0±0.5ms	79.1±1ms	0.99	benchmarks.time_kdtree_crossmatch
38.2±0.7ms	38.0±0.5ms	0.99	benchmarks.time_polygon_search
6.51±0.04s	6.32±0.01s	0.97	benchmarks.time_create_large_catalog
967±4ms	936±4ms	0.97	benchmarks.time_create_midsize_catalog

Click here to view all benchmarks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.19%. Comparing base (785c2c7) to head (d49b28c).
⚠️ Report is 166 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #850   +/-   ##
=======================================
  Coverage   95.19%   95.19%           
=======================================
  Files          54       54           
  Lines        2558     2558           
=======================================
  Hits         2435     2435           
  Misses        123      123           

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