Update README.md

[ahcorde]

🦟 Documentation fix

Fixes gazebosim/gazebo_test_cases#355

Summary

Fixed links and include python in the folder structure

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #2124 (85d9fb2) into gz-sim8 (58a0c0b) will decrease coverage by 0.02%.
Report is 2 commits behind head on gz-sim8.
The diff coverage is n/a.

❗ Current head 85d9fb2 differs from pull request most recent head d4948dd. Consider uploading reports for the commit d4948dd to get more accurate results

@@             Coverage Diff             @@
##           gz-sim8    #2124      +/-   ##
===========================================
- Coverage    65.45%   65.43%   -0.02%     
===========================================
  Files          323      323              
  Lines        30699    30699              
===========================================
- Hits         20094    20088       -6     
- Misses       10605    10611       +6     

see 1 file with indirect coverage changes

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