MNT: adding adsabs links to the ignore list

[bsipocz]

as they are blocked for sphinx-build

This should resolve #782

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.52%. Comparing base (ca75b99) to head (f22b82c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #783   +/-   ##
=======================================
  Coverage   80.52%   80.52%           
=======================================
  Files          90       90           
  Lines       10352    10352           
=======================================
  Hits         8336     8336           
  Misses       2016     2016           

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