Update configuration.md

[davidspeijer]

Remove legacy doc about auto include config file in bootstrap.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.73%. Comparing base (3d7886a) to head (19702af).
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #440   +/-   ##
=========================================
  Coverage     71.73%   71.73%           
  Complexity      760      760           
=========================================
  Files            40       40           
  Lines          2675     2675           
=========================================
  Hits           1919     1919           
  Misses          756      756           

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