Move children schema to strands remove use of deprecated module

[cortadocodes]

Contents (#112)

Operations

• Add ReadTheDocs config file
• Fix codecov upload
• Use reusable workflows
• Test with python3.9 too
• Upgrade actions

Dependencies

• Fix documentation requirements

Refactoring

• Move children and manifest schemas to Strands

Fixes

• Fix accordion usage in docs
• Swap deprecated/removed pkg_resources for importlib

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.78%. Comparing base (30ce2cf) to head (78a71c6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   87.54%   87.78%   +0.23%     
==========================================
  Files           7        7              
  Lines         257      262       +5     
==========================================
+ Hits          225      230       +5     
  Misses         32       32              

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