allow URL and DOI in feedback form associated articles related bibcodes

[shinyichen]

• When relationship is 'other', allow URL and DOI in the associated bibcodes.
• DOI and URL are not validated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.7%. Comparing base (5af91ce) to head (38224c1).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #557     +/-   ##
========================================
- Coverage    51.7%   51.7%   -0.0%     
========================================
  Files         319     319             
  Lines       37737   37737             
  Branches      632     632             
========================================
- Hits        19477   19475      -2     
- Misses      18250   18252      +2     
  Partials       10      10             

see 1 file with indirect coverage changes

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[thostetler]

LGTM