Suggested changes from science homework.

[delucchi-cmu]

See: astronomy-commons/lsdb#541

• Give (only slightly) more friendly error message when some stages of the import task fail
• Clarify that the "public catalogs" page is just tips for various catalogs
• Provide link to data.lsdb.io
• Fix doc links for import notebooks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.11%. Comparing base (2e50284) to head (50f49a1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #476   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files          28       28           
  Lines        1802     1802           
=======================================
  Hits         1714     1714           
  Misses         88       88           

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[gitosaurus]

LGTM!