MNT: Final refactor before v1.2

[Gui-FernandesBR]

Pull request type

• Code maintenance (refactoring, formatting, tests)
• ReadMe, Docs and GitHub updates

Checklist

• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

Current behavior

Some comments made in the #536 PR conversation.

New behavior

Read the commit messages one by one.

Breaking change

• No

Additional information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e4e67f4) 72.47% compared to head (1d819d1) 72.47%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #553   +/-   ##
========================================
  Coverage    72.47%   72.47%           
========================================
  Files           59       59           
  Lines         9566     9567    +1     
========================================
+ Hits          6933     6934    +1     
  Misses        2633     2633           

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