Generate Solidity documentation

[james-toussaint]

• Preview: https://github.com/iExecBlockchainComputing/PoCo/blob/feature/generate-sol-doc/docs/solidity/index.md
• Notes:
  • Particularly nice when code is properly documented (makes sense 🙃)
  • Decided to use the "single-page" format since Poco contracts are mostly forming a "diamond" proxy, hence it is easier for users to get info in a single page rather than looking/browsing many files
• Sample:
  

[zguesmi]

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.75%. Comparing base (2ea02d5) to head (006f046).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #111   +/-   ##
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  Coverage    83.75%   83.75%           
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  Files           34       34           
  Lines         1077     1077           
  Branches       222      202   -20     
========================================
  Hits           902      902           
  Misses         175      175           

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