Added basic pipeline for markdown guide

[bsekachev]

Motivation and context

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have added a description of my changes into the CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)
• I have increased versions of npm packages if it is necessary
  (cvat-canvas,
  cvat-core,
  cvat-data and
  cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[codecov]

Codecov Report

Merging #6381 (8416f7b) into develop (e6a38da) will increase coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6381      +/-   ##
===========================================
+ Coverage    80.66%   80.82%   +0.15%     
===========================================
  Files          331      332       +1     
  Lines        38431    38438       +7     
  Branches      6923     6923              
===========================================
+ Hits         31002    31068      +66     
+ Misses        7113     7053      -60     
- Partials       316      317       +1     

Components	Coverage Δ
cvat-ui	75.06% <ø> (+0.32%)	⬆️
cvat-server	86.16% <ø> (-0.01%)	⬇️