Add code highlight for docs

[denisart]

A few updates for docs. The main update it is added code highlight for material theme by https://squidfunk.github.io/mkdocs-material/reference/code-blocks/?h=code#configuration

For example

Old

New

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@a46fe94). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1738   +/-   ##
=======================================
  Coverage        ?   98.98%           
=======================================
  Files           ?       37           
  Lines           ?     4126           
  Branches        ?      959           
=======================================
  Hits            ?     4084           
  Misses          ?       26           
  Partials        ?       16           

Flag	Coverage Δ
unittests	98.66% <0.00%> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #1738 will not alter performance

_{Comparing denisart:update-docs (03e0b02) with main (a46fe94)}

Summary

✅ 29 untouched benchmarks