🔧 Add better typing for extra_links config variable

[chrisjsewell]

To detail all possible dict keys

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 85.94%. Comparing base (63e1169) to head (0cd5991).

Files	Patch %	Lines
sphinx_needs/directives/needflow.py	75.00%	2 Missing ⚠️
sphinx_needs/config.py	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1131      +/-   ##
==========================================
+ Coverage   85.90%   85.94%   +0.03%     
==========================================
  Files          56       56              
  Lines        6515     6537      +22     
==========================================
+ Hits         5597     5618      +21     
- Misses        918      919       +1     

Flag	Coverage Δ
pytests	85.94% <91.66%> (+0.03%)	⬆️

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