Keep docutils <0.16 for documentation

[PrimozGodec]

Issue

Docutils 0.17 causes different html structure which is not correctly handled with documentation handler in widget-base.

Description of changes

Keep it below 0.17 until the documentation handler is fixed.

Includes

• [ ] Code changes
• [ ] Tests
• [ ] Documentation

[codecov-commenter]

Codecov Report

Merging #388 (aa2b67d) into master (c978961) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #388   +/-   ##
=======================================
  Coverage   80.49%   80.49%           
=======================================
  Files          21       21           
  Lines        5450     5450           
=======================================
  Hits         4387     4387           
  Misses       1063     1063           

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