remove the dependency on mkdocs-minify because of issue #938.

[JPBergsma]

I removed the references to minify because of Matthews remark in #938

Closes #938.

[codecov]

Codecov Report

Merging #941 (b7becc7) into master (11477de) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #941   +/-   ##
=======================================
  Coverage   92.78%   92.78%           
=======================================
  Files          67       67           
  Lines        3786     3786           
=======================================
  Hits         3513     3513           
  Misses        273      273           

Flag	Coverage Δ
project	92.78% <ø> (ø)
validator	92.78% <ø> (ø)

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[ml-evs]

Thanks for reporting and fixing this @JPBergsma!