better website

[atsyplenkov]

• update articles

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.74%. Comparing base (a64de74) to head (262dc12).
⚠️ Report is 5 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #21   +/-   ##
=======================================
  Coverage   67.74%   67.74%           
=======================================
  Files          15       15           
  Lines         372      372           
=======================================
  Hits          252      252           
  Misses        120      120           

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