skip doi links that are broken

[elbeejay]

PR ignores the DOI links that were breaking the "link check" and therefore breaking the docs build:

https://github.com/DeltaRCM/pyDeltaRCM/actions/runs/4580269572/jobs/8088848177

[codecov[bot]]

Codecov Report

Merging #268 (60bf1e9) into develop (e542f18) will decrease coverage by 0.04%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #268      +/-   ##
===========================================
- Coverage    78.86%   78.82%   -0.04%     
===========================================
  Files           12       12              
  Lines         2616     2616              
===========================================
- Hits          2063     2062       -1     
- Misses         553      554       +1     

see 1 file with indirect coverage changes

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