[WIP] Add support for MPContribs.

[deepanshs]

• Convert each sites to mpcontribs card.

[codecov]

Codecov Report

Attention: Patch coverage is 99.52381% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.97%. Comparing base (01b4472) to head (2b64242).
Report is 1187 commits behind head on master.

Files with missing lines	Patch %	Lines
src/mrsimulator/transition/pathway.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   99.98%   99.97%   -0.02%     
==========================================
  Files         100      103       +3     
  Lines        6605     6796     +191     
==========================================
+ Hits         6604     6794     +190     
- Misses          1        2       +1     

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