docs: Add registries to Solidity documentation

[zguesmi]

No description provided.

[Copilot]

Pull Request Overview

This PR adds registry-related Solidity documentation to the generated docs by removing the exclusion of registries from the documentation generation in the Hardhat configuration.

• Removes the 'registries' exclusion from the docgen configuration
• Reorganizes existing documentation by moving IexecOrderManagementFacet section
• Adds comprehensive documentation for registry contracts including IRegistry, Registry, RegistryEntry, App, AppRegistry, Dataset, DatasetRegistry, Workerpool, and WorkerpoolRegistry

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
hardhat.config.ts	Removes 'registries' from the excluded paths to enable registry documentation generation
docs/solidity/index.md	Adds extensive registry documentation and reorganizes existing sections

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.66%. Comparing base (f7c634b) to head (8b0e3b1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #258   +/-   ##
=======================================
  Coverage   83.66%   83.66%           
=======================================
  Files          38       38           
  Lines        1218     1218           
  Branches      227      227           
=======================================
  Hits         1019     1019           
  Misses        199      199           

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