More examples of .derived and .define (semi auto), show using overrides with options/eithers/collections, minor docs fixes

[MateuszKubuszok]

TODO:

• product examples of .derived
• enum examples of .derived
• patchers examples of .derived
• option examples of _.matchingSome
• either examples of .matchingLeft/.matchingRight
• collection examples of .everyItem/.everyMapKey
• example that value type can be overriden like product
• custom transformation section (mention when it is NOT necessary)
• maybe add scaladocs section about using derive/define instead
• patcher cookbook for updating Options in API?
• update year in docs?
• fix chimney-version (1 letter too many)?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.92%. Comparing base (0a049ff) to head (1709d23).
Report is 12 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #693   +/-   ##
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  Coverage   86.92%   86.92%           
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  Files         183      183           
  Lines        8185     8185           
  Branches      776      785    +9     
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  Hits         7115     7115           
  Misses       1070     1070           

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