docs: add more data processing steps to the classification tutorial

[LIEeOoNn]

Closes #686

Summary of Changes

0. Improved text
1. removed columns name, id, ticket, parents_children, cabin completely
2. OneHot encoded sex and port_embarked
3. SimpleImpute age and fare
4. reverse transformed OneHot encoding

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.38s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.67%. Comparing base (8f78163) to head (0a72f48).
Report is 48 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #878      +/-   ##
==========================================
+ Coverage   97.63%   97.67%   +0.03%     
==========================================
  Files         117      120       +3     
  Lines        6059     6234     +175     
==========================================
+ Hits         5916     6089     +173     
- Misses        143      145       +2     

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[lars-reimann]

The heading were still too long and technical. I've now added some suggestions that focus more on the task to solve than on API elements that must be used. You don't need to take the suggestions literally. If you have a different wording that is clearer or more concise, use it.

[lars-reimann]

Final request:

Add some explanation to the sections

• Marking the Target Column
• Reverse-Transforming the Prediction
• Testing the Accuracy of the Model

What do you do there and how?

[lars-reimann]

Thanks, excellent work.

[lars-reimann]

🎉 This PR is included in version 0.27.0 🎉

The release is available on:

• v0.27.0
• GitHub release

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