Assorted small doc fixes

[delucchi-cmu]

• add link to contribution guide and CoC in the pull request template
• add link to CoC in contribution guide
• fix import path in catalog import arguments in argument descriptions page
• set contribution guide to use .setup_dev.sh script
• remove mac-specific healpy installation (no longer needed)
• suggest larger threshold for slightly larger leaf parquet files on catalog import
• provider pointers to where input reader kwargs will be passed

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.52%. Comparing base (3f7a423) to head (9639064).
Report is 52 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #310   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          25       25           
  Lines        1274     1274           
=======================================
  Hits         1268     1268           
  Misses          6        6           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.